1
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Horwitz MA. Local desymmetrization as an engine of stereochemical elaboration in total synthesis. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153776] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Nájera C, Foubelo F, Sansano JM, Yus M. Enantioselective desymmetrization reactions in asymmetric catalysis. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132629] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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3
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Capel E, Rodríguez-Rodríguez M, Uria U, Pedron M, Tejero T, Vicario JL, Merino P. Absence of Intermediates in the BINOL-Derived Mg(II)/Phosphate-Catalyzed Desymmetrizative Ring Expansion of 1-Vinylcyclobutanols. J Org Chem 2021; 87:693-707. [PMID: 34928602 PMCID: PMC8749959 DOI: 10.1021/acs.joc.1c02699] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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The catalyzed desymmetrizative
ring expansion of alkenylcyclobutanols
promoted by halofunctionalization of the alkene moiety with N-bromosuccinimide has been experimentally and computationally
studied. The reaction yields highly enantioenriched cyclopentanones
bearing two all-carbon quaternary stereocenters, one of them being
generated in the rearrangement of the cyclobutane ring and the other
by enantioselective desymmetrization. The reaction is competitive
with the formation of a spiroepoxide, but it turns completely selective
toward the cyclopentanone when a chiral bisphosphonium magnesium salt
is employed as a catalyst. Mechanistic studies support the formation
of an ion pair leading to a complex with only a unit of phosphoric
acid, which is the resting state of the catalytic cycle. Calculations
reproduce in an excellent way the observed reactivity and predict
the effect exerted by the substituents of the aromatic ring linked
to the double bond. The computational studies also revealed the reaction
as a highly asynchronous concerted process taking place as one kinetic
step but in two stages: (i) halogenation of the double bond and (ii)
rearrangement of the cyclobutane. No intermediates are present in
the reaction as energy minima. The experimental scope of the reaction
further confirms the predictions for the observed reactivity and selectivity.
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Affiliation(s)
- Estefania Capel
- University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | | | - Uxue Uria
- University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | - Manuel Pedron
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Tomas Tejero
- Instituto de Sintesis y Catalisis Homogenea (ISQCH), Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain
| | - Jose L Vicario
- University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | - Pedro Merino
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Universidad de Zaragoza, 50009 Zaragoza, Spain
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4
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Fujino H, Nagatomo M, Inoue M. Total Syntheses of Hikosamine and Hikizimycin. J Org Chem 2021; 86:16220-16230. [PMID: 34569228 DOI: 10.1021/acs.joc.1c01773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hikizimycin (1) is a potent anthelmintic and antibacterial natural product. The core 4-amino-4-deoxyundecose sugar (hikosamine) of 1 consists of an 11-carbon linear chain substituted with one amino group and 10 hydroxy groups. The C1 and C6O positions of the 10 contiguous stereocenters are further appended by a cytosine base and a 3-amino-3-deoxyglucose sugar (kanosamine), respectively. Since the structural determination in the early 1970s, synthetic chemists have been attracted by this exceedingly complex structure and have investigated the full chemical construction of 1. These synthetic efforts culminated in four syntheses of the protected hikosamines and two total syntheses of 1. In this Perspective, we summarize the strategies and tactics utilized in these syntheses to showcase the evolution of modern natural product synthesis.
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Affiliation(s)
- Haruka Fujino
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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5
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Cheng P, Lu H, Zu L. A Local Desymmetrization Approach to Piperidinyl Acetic Acid γ-Secretase Modulators. J Org Chem 2021; 86:15481-15487. [PMID: 34641679 DOI: 10.1021/acs.joc.1c01970] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A desymmetrization-based approach for the synthesis of piperidinyl acetic acid γ-secretase modulators has been developed. The synthetic sequence features the use of N-tert-butanesulfinyl imine reduction and a diastereoselective lactam formation to set up the chiral centers. The synthetic utility is demonstrated by the concise asymmetric synthesis of γ-secretase modulator GSM-1.
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Affiliation(s)
- Peng Cheng
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, Tsinghua University, Beijing 100084, China
| | - Haigen Lu
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, Tsinghua University, Beijing 100084, China
| | - Liansuo Zu
- School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Beijing Advanced Innovation Center for Structural Biology & Frontier Research Center for Biological Structure, Tsinghua University, Beijing 100084, China
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6
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Lodhi R, Prakash M, Samanta S. Diastereoselective desymmetrization reactions of prochiral para-quinamines with cyclopropenes generated in situ: access to fused hydroindol-5-one scaffolds. Org Biomol Chem 2021; 19:7129-7133. [PMID: 34369544 DOI: 10.1039/d1ob01322j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Interesting desymmetric [3 + 2] annulation reactions between p-quinamines as prochiral N-donors and 2-aroyl-1-chlorocyclopropanecarboxylates facilitated by a base are reported. This successive double Michael reaction delivered a unique class of cyclopropane-fused hydoindol-5-one frameworks, each having four contiguous stereogenic centers, with three of them being fully substituted. Moreover, this method was found to provide acceptable chemical yields with promising diastereoselectivities (dr of up to ≤95 : 5) and to work with a variety of substrates. Importantly, a polycyclic tacrine analogue used to treat Alzheimer's disease was synthesized using our developed method.
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Affiliation(s)
- Rajni Lodhi
- Department of Chemistry, Indian Institute of Technology Indore, Simrol, 453552, India.
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7
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Rodriguez S, Uria U, Reyes E, Prieto L, Rodríguez-Rodríguez M, Carrillo L, Vicario JL. Enantioselective construction of the 8-azabicyclo[3.2.1]octane scaffold: application in the synthesis of tropane alkaloids. Org Biomol Chem 2021; 19:3763-3775. [PMID: 33949549 DOI: 10.1039/d1ob00143d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 8-azabicyclo[3.2.1]octane scaffold is the central core of the family of tropane alkaloids, which display a wide array of interesting biological activities. As a consequence, research directed towards the preparation of this basic structure in a stereoselective manner has attracted attention from many research groups worldwide across the years. Despite this, most of the approaches rely on the enantioselective construction of an acyclic starting material that contains all the required stereochemical information to allow the stereocontrolled formation of the bicyclic scaffold. As an alternative, there are a number of important methodologies reported in which the stereochemical control is achieved directly in the same transformation that generates the 8-azabicyclo[3.2.1]octane architecture or in a desymmetrization process starting from achiral tropinone derivatives. This review compiles the most relevant achievements in these areas.
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Affiliation(s)
- Sandra Rodriguez
- Department of Organic and Inorganic Chemistry, University of the Basque Country, P. O. Box 644, 48080 Bilbao, Spain.
| | - Uxue Uria
- Department of Organic and Inorganic Chemistry, University of the Basque Country, P. O. Box 644, 48080 Bilbao, Spain.
| | - Efraim Reyes
- Department of Organic and Inorganic Chemistry, University of the Basque Country, P. O. Box 644, 48080 Bilbao, Spain.
| | - Liher Prieto
- Department of Organic and Inorganic Chemistry, University of the Basque Country, P. O. Box 644, 48080 Bilbao, Spain.
| | - Marta Rodríguez-Rodríguez
- Department of Organic and Inorganic Chemistry, University of the Basque Country, P. O. Box 644, 48080 Bilbao, Spain.
| | - Luisa Carrillo
- Department of Organic and Inorganic Chemistry, University of the Basque Country, P. O. Box 644, 48080 Bilbao, Spain.
| | - Jose L Vicario
- Department of Organic and Inorganic Chemistry, University of the Basque Country, P. O. Box 644, 48080 Bilbao, Spain.
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8
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Chaheine CM, Gladen PT, Abbasov ME, Romo D. Enantioselective, Organocatalytic Strategy for the Oxazolomycin Core: Formal Synthesis of (+)-Neooxazolomycin. Org Lett 2020; 22:9282-9286. [PMID: 33226820 DOI: 10.1021/acs.orglett.0c03511] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A concise, organocatalytic, enantioselective route to the γ-lactam core of the oxazolomycins was developed. Key steps include a Lewis base-catalyzed, Michael proton transfer-lactamization organocascade, a one-pot N-methylation and diastereoselective α-alkylation, a diastereotopic group-selective reduction, a substrate-directed allylic hydroxylation, and a lanthanide-mediated organolithium addition to append the side chain. A formal synthesis of (+)-neooxazolomycin via interception of a Kende intermediate, accessed in 10 steps (previously 24 steps from α-d-glucose), enabled confirmation of the relative and absolute stereochemistry.
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Affiliation(s)
- Christian M Chaheine
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Avenue, Waco, Texas 76798-7046, United States
| | - Paul T Gladen
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Avenue, Waco, Texas 76798-7046, United States
| | - Mikail E Abbasov
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Avenue, Waco, Texas 76798-7046, United States
| | - Daniel Romo
- Department of Chemistry and Biochemistry, Baylor University, 101 Bagby Avenue, Waco, Texas 76798-7046, United States
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9
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Dajek M, Pruszczyńska A, Konieczny KA, Kowalczyk R. Cinchona Squaramide‐Catalyzed Intermolecular Desymmetrization of 1,3‐Diketones Leading to Chiral 1,4‐Dihydropyridines. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000455] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Maciej Dajek
- Department of ChemistryWroclaw University of Science and Technology
| | | | | | - Rafał Kowalczyk
- Department of ChemistryWroclaw University of Science and Technology
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10
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Horwitz MA, Robins JG, Johnson JS. De Novo Synthesis of the DEF-Ring Stereotriad Core of the Veratrum Alkaloids. J Org Chem 2020; 85:6808-6814. [PMID: 32352768 PMCID: PMC7246867 DOI: 10.1021/acs.joc.0c00685] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis of the stereotriad core in the eastern portion of the Veratrum alkaloids jervine (1), cyclopamine (2), and veratramine (3) is reported. Starting from a known β-methyltyrosine derivative (8), the route utilizes a diastereoselective substrate-controlled 1,2-reduction to establish the stereochemistry of the vicinal amino alcohol motif embedded within the targets. Oxidative dearomatization is demonstrated to be a viable approach for the synthesis of the spirocyclic DE ring junction found in jervine and cyclopamine.
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Affiliation(s)
- Matthew A Horwitz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Jacob G Robins
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Jeffrey S Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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11
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Patel K, Mishra UK, Mukhopadhyay D, Ramasastry SSV. Beyond the Corey-Chaykovsky Reaction: Synthesis of Unusual Cyclopropanoids via Desymmetrization and Thereof. Chem Asian J 2019; 14:4568-4571. [PMID: 31513351 DOI: 10.1002/asia.201901108] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/11/2019] [Indexed: 01/11/2023]
Abstract
Desymmetrization-based protocols for the synthesis of highly functionalized indeno-spirocyclopropanes and cyclopropa-fused indanes have been established through unexpected reactions triggered by the Corey-Chaykovsky reagent. These structures were further elaborated in one step to privileged scaffolds such as fluorenones, indenones, and naphthaphenones. For instance, an acid-catalyzed transformation of indeno-spirocyclopropanes provided fluorenones via a homo-Nazarov-type cyclization, and naphthaphenones were obtained via an acid-catalyzed cyclopropane ring-opening/retro-Michael sequence.
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Affiliation(s)
- Kaushalendra Patel
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, S. A. S. Nagar, Manauli PO, Punjab, 140306, India
| | - Uttam K Mishra
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, S. A. S. Nagar, Manauli PO, Punjab, 140306, India
| | - Dipto Mukhopadhyay
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, S. A. S. Nagar, Manauli PO, Punjab, 140306, India
| | - S S V Ramasastry
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, S. A. S. Nagar, Manauli PO, Punjab, 140306, India
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12
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Wen S, Boyce JH, Kandappa SK, Sivaguru J, Porco JA. Regiodivergent Photocyclization of Dearomatized Acylphloroglucinols: Asymmetric Syntheses of (-)-Nemorosone and (-)-6- epi-Garcimultiflorone A. J Am Chem Soc 2019; 141:11315-11321. [PMID: 31264859 DOI: 10.1021/jacs.9b05600] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Regiodivergent photocyclization of dearomatized acylphloroglucinol substrates has been developed to produce type A polycyclic polyprenylated acylphloroglucinol (PPAP) derivatives using an excited-state intramolecular proton transfer (ESIPT) process. Using this strategy, we achieved the enantioselective total syntheses of the type A PPAPs (-)-nemorosone and (-)-6-epi-garcimultiflorone A. Diverse photocyclization substrates have been investigated leading to divergent photocyclization processes as a function of tether length. Photophysical studies were performed, and photocyclization mechanisms were proposed based on investigation of various substrates as well as deuterium-labeling experiments.
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Affiliation(s)
- Saishuai Wen
- Department of Chemistry, Center for Molecular Discovery (BU-CMD) , Boston University , 590 Commonwealth Avenue , Boston , Massachusetts 02215 , United States
| | - Jonathan H Boyce
- Department of Chemistry, Center for Molecular Discovery (BU-CMD) , Boston University , 590 Commonwealth Avenue , Boston , Massachusetts 02215 , United States
| | - Sunil K Kandappa
- Center for Photochemical Sciences and the Department of Chemistry , Bowling Green State University , Bowling Green , Ohio 43403-0001 , United States
| | - Jayaraman Sivaguru
- Center for Photochemical Sciences and the Department of Chemistry , Bowling Green State University , Bowling Green , Ohio 43403-0001 , United States
| | - John A Porco
- Department of Chemistry, Center for Molecular Discovery (BU-CMD) , Boston University , 590 Commonwealth Avenue , Boston , Massachusetts 02215 , United States
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13
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Lee J, Chen DYK. A Local-Desymmetrization-Based Divergent Synthesis of Quinine and Quinidine. Angew Chem Int Ed Engl 2018; 58:488-493. [PMID: 30394634 DOI: 10.1002/anie.201811530] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Indexed: 12/14/2022]
Abstract
Herein we report a novel synthetic entry to the legendary quinuclidine natural products quinine and quinidine. The developed strategy is based on the use of a symmetrical and nonstereogenic precursor to access quinine and quinidine through a "local-desymmetrization" approach, in stark contrast conceptually to the preparation of stereodefined disubstituted piperidines (or their acyclic precursors) as featured in all past syntheses. The developed strategy also provided quinine and quinidine derivatives that could not be readily obtained through previous total syntheses or by modification of the naturally occurring substances.
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Affiliation(s)
- Jaehoo Lee
- Department of Chemistry, Seoul National University, Gwanak-1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - David Y-K Chen
- Department of Chemistry, Seoul National University, Gwanak-1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
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14
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Lee J, Chen DYK. A Local-Desymmetrization-Based Divergent Synthesis of Quinine and Quinidine. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jaehoo Lee
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 08826 South Korea
| | - David Y.-K. Chen
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 08826 South Korea
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15
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Kawamata T, Yamaguchi A, Nagatomo M, Inoue M. Convergent Total Synthesis of Asimicin via Decarbonylative Radical Dimerization. Chemistry 2018; 24:18907-18912. [DOI: 10.1002/chem.201805317] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Indexed: 12/20/2022]
Affiliation(s)
- Takahiro Kawamata
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-003 Japan
| | - Akinori Yamaguchi
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-003 Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-003 Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-003 Japan
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16
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Horwitz MA, Fulton JL, Johnson JS. Enantio- and Diastereoselective Organocatalytic Conjugate Additions of Nitroalkanes to Enone Diesters. Org Lett 2018; 19:5783-5785. [PMID: 29035548 DOI: 10.1021/acs.orglett.7b02735] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Enantio- and diastereoselective conjugate addition reactions between nitroethane or nitropropane and enone diesters are reported. A bifunctional triaryliminophosphorane catalyzed the addition reaction with consistently excellent stereoselectivities and yields across a wide range of substrates. By the use of the gem-diester functional handle present in the adducts, local desymmetrization via diastereotopic group discrimination was demonstrated, and a polyfunctionalized lactam with three contiguous stereocenters was synthesized.
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Affiliation(s)
- Matthew A Horwitz
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Jennifer L Fulton
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Jeffrey S Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
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17
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Lu Z, Zhang X, Guo Z, Chen Y, Mu T, Li A. Total Synthesis of Aplysiasecosterol A. J Am Chem Soc 2018; 140:9211-9218. [PMID: 29939021 DOI: 10.1021/jacs.8b05070] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Aplysiasecosterol A (1) is a structurally unusual 9,11-secosteroid isolated from the sea hare Aplysia kurodai. We have accomplished the first and asymmetric total synthesis of 1 in a convergent fashion. The left-hand segment bearing three adjacent stereocenters was constructed through desymmetrizing reduction, ketalization, and radical cyclization. A strategy of asymmetric 2-bromoallylation followed by spontaneous desymmetrizing lactolization enabled a more expeditious access to this segment. The right-hand segment was prepared through two different approaches: one featuring Myers alkylation and Suzuki-Miyaura coupling and the other relying upon Aggarwal lithiation-borylation and Zweifel-Evans olefination. The two fragments were coupled by a Reformatsky type reaction. The three consecutive stereocenters embedded in the central domain of 1 were generated by an iron-mediated, hydrogen atom transfer based radical cyclization reaction.
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Affiliation(s)
- Zhaohong Lu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Xiang Zhang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Zhicong Guo
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Yu Chen
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Tong Mu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Ang Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
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18
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Inai M, Asakawa T, Kan T. Total synthesis of natural products using a desymmetrization strategy. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.02.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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19
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Fulton JL, Horwitz MA, Bruske EL, Johnson JS. Asymmetric Organocatalytic Sulfa-Michael Addition to Enone Diesters. J Org Chem 2018; 83:3385-3391. [PMID: 29512387 DOI: 10.1021/acs.joc.8b00007] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An asymmetric sulfa-Michael addition of alkyl thiols to enone diesters is reported. The reaction is catalyzed by a bifunctional triaryliminophosphorane-thiourea organocatalyst and provides a range of α-sulfaketones in high yields and enantioselectivities. Leveraging the gem-diester functional handle via a subsequent diastereotopic group discrimination generates functionalized lactones with three contiguous stereocenters.
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Affiliation(s)
- Jennifer L Fulton
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
| | - Matthew A Horwitz
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
| | - Ericka L Bruske
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
| | - Jeffrey S Johnson
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
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20
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Li S, Liu B, Chen L, Li X, Cheng JP. N-Heterocyclic carbene promoted enantioselective desymmetrization reaction of diarylalkane-bisphenols. Org Chem Front 2018. [DOI: 10.1039/c7qo01083d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An enantioselective NHC-catalyzed desymmetrization reaction of diarylalkane-bisphenols with aldehydes was reported under the guidance of linear free energy relationships (LFERs).
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Affiliation(s)
- Shoulei Li
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
| | - Bin Liu
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
| | - Li Chen
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-Organic Chemistry
- Collaborative Innovation Center of Chemical Science and Engineering
- Nankai University
- Tianjin 300071
- China
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21
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Chandra Sahoo S, Joshi M, Chandra Pan S. Diastereoselective Desymmetrization of Prochiral Cyclopentenediones via Cycloaddition Reaction with N-Phenacylbenzothiazolium Bromides. J Org Chem 2017; 82:12763-12770. [DOI: 10.1021/acs.joc.7b01964] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Subas Chandra Sahoo
- Department
of Chemistry, Indian Institute of Technology Guwahati, North
Guwahati, Assam 781039, India
| | - Mayank Joshi
- Department
of Chemistry, Indian Institute of Science Education and Research, Mohali, Punjab 140306, India
| | - Subhas Chandra Pan
- Department
of Chemistry, Indian Institute of Technology Guwahati, North
Guwahati, Assam 781039, India
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