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Takeda N, Miyashita T, Hirokawa N, Yasui M, Ueda M. P(III)-Mediated Formal Reductive N-H Bond Insertion Reaction of Hydrazones to α-Keto Esters. Chem Pharm Bull (Tokyo) 2024; 72:413-420. [PMID: 38684408 DOI: 10.1248/cpb.c24-00091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
A diazo-, metal-, and base-free multi-substituted hydrazone synthesis via a formal reductive N-H bond insertion reactions of hydrazones to α-keto esters has been developed. The protocol features a broad substrate scope and good functional group tolerance, providing N-H bond insertion products in moderate to excellent yields. Moreover, P(III)-mediated N-H functionalization of pharmaceutical containing hydrazone moiety was also successfully achieved.
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Ladwig A, Kroll M, Schulz S. Identification and determination of the absolute configuration of amorph-4-en-10β-ol, a cadinol-type sesquiterpene from the scent glands of the African reed frog Hyperolius cinnamomeoventris. Beilstein J Org Chem 2023; 19:167-175. [PMID: 36814452 PMCID: PMC9940504 DOI: 10.3762/bjoc.19.16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 01/25/2023] [Indexed: 02/18/2023] Open
Abstract
Hyperolid reed frogs are one of the few families of Anurans known to possess glands that emit volatile compounds used in chemical communication. Hyperolius cinnamomeoventris, a model species, possesses a gular gland on its vocal sac that emits chemicals, and sends visual and auditory signals during calling. Previous investigations have shown that the glandular compounds are typically macrocyclic lactones. However, in this work, we show that another major constituent of the male specific gland is (10R,1S,6R,7R,10R)-amorph-4-ene-10β-ol [(1R,4R,4aR,8aS)-4-isopropyl-1,6-dimethyl-1,2,3,4,4a,7,8,8a-octahydronaphthalen-1-ol]. This compound was synthesized for the first time and has the opposite configuration to amorph-4-ene-10β-ol known from plants. A short synthesis using an organocatalytic approach through a tandem Mannich/intramolecular Diels-Alder reaction led to a mixture of cadinols, which was used for the assignment of the natural cadinol structures and their stereoisomers.
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Affiliation(s)
- Angelique Ladwig
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Markus Kroll
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Stefan Schulz
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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Liu K, Studer A. Direct α-Acylation of Alkenes via N-Heterocyclic Carbene, Sulfinate, and Photoredox Cooperative Triple Catalysis. J Am Chem Soc 2021; 143:4903-4909. [PMID: 33760603 PMCID: PMC8033569 DOI: 10.1021/jacs.1c01022] [Citation(s) in RCA: 70] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Indexed: 12/25/2022]
Abstract
N-Heterocyclic carbene (NHC) catalysis has emerged as a versatile tool in modern synthetic chemistry. Further increasing the complexity, several processes have been introduced that proceed via dual catalysis, where the NHC organocatalyst operates in concert with a second catalytic moiety, significantly enlarging the reaction scope. In biological transformations, multiple catalysis is generally used to access complex natural products. Guided by that strategy, triple catalysis has been studied recently, where three different catalytic modes are merged in a single process. In this Communication, direct α-C-H acylation of various alkenes with aroyl fluorides using NHC, sulfinate, and photoredox cooperative triple catalysis is reported. The method allows the preparation of α-substituted vinyl ketones in moderate to high yields with excellent functional group tolerance. Mechanistic studies reveal that these cascades proceed through a sequential radical addition/coupling/elimination process. In contrast to known triple catalysis processes that operate via two sets of interwoven catalysis cycles, in the introduced process, all three cycles are interwoven.
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Affiliation(s)
- Kun Liu
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
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Yun JJ, Liu XY, Deng W, Chu XQ, Shen ZL, Loh TP. Chromium(III)-Catalyzed Addition of Water and Alcohol to α,β-Unsaturated Ketones for the Synthesis of β-Hydroxyl and β-Alkoxyl Ketones in Aqueous Media. J Org Chem 2018; 83:10898-10907. [DOI: 10.1021/acs.joc.8b01584] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jin-Jin Yun
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Xuan-Yu Liu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Wei Deng
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Xue-Qiang Chu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Zhi-Liang Shen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Teck-Peng Loh
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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Jiang SS, Gu BQ, Zhu MY, Yu X, Deng WP. Nonenzymatic kinetic resolution of α-aryl substituted allylic alcohols catalyzed by acyl transfer catalyst Np-PIQ. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Yusuf M, Jain P. Synthetic and biological studies of pyrazolines and related heterocyclic compounds. ARAB J CHEM 2014. [DOI: 10.1016/j.arabjc.2011.09.013] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Alcaine A, Marqués-López E, Herrera RP. Synthesis of interesting β-nitrohydrazides through a thiourea organocatalysed aza-Michael addition. RSC Adv 2014. [DOI: 10.1039/c3ra47925k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The synthesis of interesting β-nitrohydrazides, as the target product of our reaction, is reached for the first time under organocatalytic enantioselective conditions.
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Affiliation(s)
- Ana Alcaine
- Laboratorio de Síntesis Asimétrica
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- E-50009 Zaragoza, Spain
| | - Eugenia Marqués-López
- Laboratorio de Síntesis Asimétrica
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- E-50009 Zaragoza, Spain
| | - Raquel P. Herrera
- Laboratorio de Síntesis Asimétrica
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- E-50009 Zaragoza, Spain
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Gembus V, Furman C, Millet R, Mansouri R, Chavatte P, Levacher V, Brière JF. Scaffold hopping strategy toward original pyrazolines as selective CB₂ receptor ligands. Eur J Med Chem 2012; 58:396-404. [PMID: 23151320 DOI: 10.1016/j.ejmech.2012.10.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 10/13/2012] [Accepted: 10/16/2012] [Indexed: 11/27/2022]
Abstract
In line of a scaffold hopping strategy of pyrazole structures, especially known as potent CB(2) receptor antagonists, we exploited an original and convergent synthesis of a new class of C4-benzyl pyrazolines and derivatives from readily available hydrazones and enones (two or three steps). Making use of a mixture of resin supported reagents strategy an efficient domino process allowed the easy construction of various dihydropyrazoles in 63-83% yields. The obtained family of pyrazolines featured significant hCB(2)/hCB(1) selectivity in favor of hCB(2) receptors while more than 1000-3000 nM affinity was only measured for hCB(1) receptors. This is closely related to pyrazole SR144528 inverse agonist/antagonist, although a partial agonist behavior in the [(35)S]-GTPγS binding assay was mainly measured in our case pointing out a functional switch in action. Furthermore, this hCB(2) selectivity is unique within the pyrazoline CB ligands although the affinity ranging from 251 to 689 nM remains to be improved which give, however, an opportunity for further structure-activity relationship.
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Affiliation(s)
- Vincent Gembus
- INSA de Rouen, Avenue de l'Université, 76800 St Etienne du Rouvray, France
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Suriboot J, Hobbs CE, Yang YC, Bergbreiter DE. Protective encapsulation of acid-sensitive catalysts using polyethylene ligands. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26319] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Muratore ME, Shi L, Pilling AW, Storer RI, Dixon DJ. Exploiting a novel size exclusion phenomenon for enantioselective acid/base cascade catalysis. Chem Commun (Camb) 2012; 48:6351. [PMID: 22618414 DOI: 10.1039/c2cc32258g] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
A novel size exclusion phenomenon between PS-BEMP and sterically bulky BPAs, has been discovered and exploited in a one-pot base-catalysed Michael addition/acid-catalysed enantioselective N-acyliminium cyclisation cascade, allowing the preparation of structurally complex β-carbolines with moderate to good enantiocontrol.
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Affiliation(s)
- Michael E Muratore
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK.
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Yoo WJ, Yuan H, Miyamura H, Kobayashi S. Oxidative transformation of N-substituted 2-aminophenols to 2-substituted benzoxazoles catalyzed by polymer-incarcerated and carbon-stabilized platinum nanoclusters. CAN J CHEM 2012. [DOI: 10.1139/v11-161] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The preparation of 2-substituted benzoxazoles was achieved through a sequential aerobic oxidation – enolization – oxidative cyclization reaction of N-substituted 2-aminophenols catalyzed by platinum nanoclusters supported on a polymer / carbon black composite material.
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Affiliation(s)
- Woo-Jin Yoo
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hao Yuan
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroyuki Miyamura
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shū Kobayashi
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Jiang J, Cai Y, Chen W, Lin L, Liu X, Feng X. Enantioselective aza-Michael reaction of hydrazide to chalcones through the nonactivated amine moiety conjugated addition. Chem Commun (Camb) 2011; 47:4016-8. [DOI: 10.1039/c0cc05804a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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