1
|
Mohiti M, Lu Y, He H, Ni SF, Somfai P. Regio- and Enantioselective Synthesis of 1,2-Diamines by Formal Hydroamination of Enamines: Scope, Mechanism, and Asymmetric Synthesis of Orthogonally Protected Bis-Piperazines as a Privileged Scaffold. Chemistry 2024; 30:e202303078. [PMID: 38205968 DOI: 10.1002/chem.202303078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 01/09/2024] [Accepted: 01/11/2024] [Indexed: 01/12/2024]
Abstract
We have previously reported the first formal hydroamination of enamines for the synthesis of chiral 1,2-diamines. Here, we describe: (i) the discovery, optimization, and substrate expansion of this reaction; (ii) a novel and straightforward protocol for the "click-type" synthesis of enamines in quantitative yield utilizing sodium sulfate in a dual role as an ancillary and dehydrating agent without the need for workup or purification; (iii) the application of this methodology to the first enantioselective synthesis of orthogonally protected 1,1'-(1-(4-fluorophenyl)ethane-1,2-diyl) piperazines, a scaffold for rapid lead optimization in drug discovery; (iv) a computational investigation into the mechanism and rationalization of the enantioselectivities of the reaction.
Collapse
Affiliation(s)
- Maziar Mohiti
- Center for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, 22100, Lund, Sweden
| | - Yu Lu
- Center for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, 22100, Lund, Sweden
| | - Hui He
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong, 515063, P.R. China
| | - Shao-Fei Ni
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong, 515063, P.R. China
| | - Peter Somfai
- Center for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, 22100, Lund, Sweden
| |
Collapse
|
2
|
Bing JA, Schley ND, Johnston JN. Fluorine-induced diastereodivergence discovered in an equally rare enantioselective syn-aza-Henry reaction. Chem Sci 2022; 13:2614-2623. [PMID: 35356677 PMCID: PMC8890141 DOI: 10.1039/d1sc05910f] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 02/03/2022] [Indexed: 11/21/2022] Open
Abstract
Attention to the aza-Henry reaction, particularly over the past two decades, has resulted in a wide range of effective catalysts for the enantio- and diastereoselective versions, driven by the versatility of the β-amino nitroalkane products as precursors to secondary amines and vic-diamines. Despite this broad effort, syn-diastereoselective variants are exceedingly rare. We have discovered a subset of α-fluoro nitroalkane additions that are characterized by an unusual crossover in diastereoselection, often delivering the products with high selectivities. We report here a rigorous comparative analysis of non-fluorinated and α-fluoro nitroalkanes in their additions to azomethines. Both homogeneous and heterogeneous catalysis were applied to probe the possibility that this phenomenon might be more widely operative in the enantioselective additions of fluorine-substituted carbon nucleophiles. A complete correlation within four categories is described that uncovered a clear trend, while revealing a dramatic and distinct reversal of diastereoselection that would normally go undetected.
Collapse
Affiliation(s)
- Jade A Bing
- Department of Chemistry, Vanderbilt Institute of Chemical Biology, Vanderbilt University Nashville Tennessee 37235-1822 USA
| | - Nathan D Schley
- Department of Chemistry, Vanderbilt Institute of Chemical Biology, Vanderbilt University Nashville Tennessee 37235-1822 USA
| | - Jeffrey N Johnston
- Department of Chemistry, Vanderbilt Institute of Chemical Biology, Vanderbilt University Nashville Tennessee 37235-1822 USA
| |
Collapse
|
3
|
Liu T, Ni S, Guo W. Practical asymmetric amine nucleophilic approach for the modular construction of protected α-quaternary amino acids. Chem Sci 2022; 13:6806-6812. [PMID: 35774153 PMCID: PMC9200120 DOI: 10.1039/d2sc02318k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 05/15/2022] [Indexed: 12/12/2022] Open
Abstract
We report the first amine nucleophilic approach for the modular construction of enantioenriched protected α-quaternary amino acids. The key to success is the use of an alcohol solvent, which makes a rationally designed COOMe-bonded Cu-allenylidene electrophilic intermediate stable enough to couple with amine nucleophiles before its decomposition. The reaction features wide functional group tolerance with high enantioselectivity, typically >90% ee, and is amenable to the modification of commercially available bioactive molecules. The resultant protected α-amino acids could be readily converted into a number of precious enantioenriched amines featuring α-hindered tertiary carbon centers, which are otherwise synthetically quite challenging, including those of α-amino aldehyde, peptides or α-vinyl amino ester with >92% ee in excellent yields. This protocol could be utilized for the synthesis of the protected bioactive α-ethylnorvaline in 3 steps, a significant advancement in comparison to an 11-step sequence reported previously. We report the first amine nucleophilic approach for the modular construction of enantioenriched protected α-quaternary amino acids.![]()
Collapse
Affiliation(s)
- Teng Liu
- Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University, Yanxiang Road 99, Xi'an 710045, China
| | - Shaofei Ni
- Department of Chemistry, Shantou University, Shantou 515063, China
| | - Wusheng Guo
- Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University, Yanxiang Road 99, Xi'an 710045, China
| |
Collapse
|
4
|
Struble TJ, Smajlagic I, Foy H, Dudding T, Johnston JN. DFT-Based Stereochemical Rationales for the Bifunctional Brønsted Acid/Base-Catalyzed Diastereodivergent and Enantioselective aza-Henry Reactions of α-Nitro Esters. J Org Chem 2021; 86:15606-15617. [PMID: 34669416 DOI: 10.1021/acs.joc.1c02112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A pair of chiral bis(amidine) [BAM] proton complexes provide reagent (catalyst)-controlled, highly diastereo- and enantioselective direct aza-Henry reactions leading to α-alkyl-substituted α,β-diamino esters. A C2-symmetric ligand provides high anti-selectivity, while a nonsymmetric congener exhibits syn-selectivity in this example of diastereodivergent, enantioselective catalysis. A detailed computational analysis is reported for the first time, one that supports distinct models for selectivity resulting from the more hindered binding cavity of the C1-symmetric ligand. Binding in this congested pocket accommodates four hydrogen bond contacts among ligands and substrates, ultimately favoring a pre-syn arrangement highlighted by pyridinium-azomethine activation and quinolinium-nitronate activation. The complementary transition states reveal a wide range of alternatives. Comparing the C1- and C2-symmetric catalysts highlights distinct electrophile binding orientations despite their common hydrogen bond donor-acceptor features. Among the factors driving unusual high syn-diastereoselection are favorable dispersion forces that leverage the anthracenyl substituent of the C1-symmetric ligand.
Collapse
Affiliation(s)
- Thomas J Struble
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Ivor Smajlagic
- Department of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
| | - Hayden Foy
- Department of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
| | - Travis Dudding
- Department of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
| | - Jeffrey N Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| |
Collapse
|
5
|
Zhou P, Shao X, Malcolmson SJ. A Diastereodivergent and Enantioselective Approach to syn- and anti-Diamines: Development of 2-Azatrienes for Cu-Catalyzed Reductive Couplings with Imines That Furnish Allylic Amines. J Am Chem Soc 2021; 143:13999-14008. [PMID: 34424694 DOI: 10.1021/jacs.1c07707] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We introduce a new reagent class, 2-azatrienes, as a platform for catalytic enantioselective synthesis of allylic amines. Herein, we demonstrate their promise by a diastereodivergent synthesis of syn- and anti-1,2-diamines through their Cu-bis(phosphine)-catalyzed reductive couplings with imines. With Ph-BPE as the supporting ligand, anti-diamines are obtained (up to 91% yield, >20:1 dr, and >99:1 er), and with the rarely utilized t-Bu-BDPP, syn-diamines are generated (up to 76% yield, 1:>20 dr, and 97:3 er).
Collapse
Affiliation(s)
- Pengfei Zhou
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Xinxin Shao
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang 310036, P. R. China
| | - Steven J Malcolmson
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| |
Collapse
|
6
|
Zhou K, Bao M, Sha H, Dong G, Hong K, Xu X, Hu W. Highly diastereoselective synthesis of vicinal diamines via a Rh-catalyzed three-component reaction of diazo compounds with diarylmethanimines and ketimines. Org Chem Front 2021. [DOI: 10.1039/d1qo00083g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Rh-catalyzed selective three-component reaction of diazo compounds with diarylmethanimines and ketimines is reported that offers an efficient and convenient access to vicinal diamine derivatives with two tertiary stereocenters in high yields.
Collapse
Affiliation(s)
- Kai Zhou
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Ming Bao
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Hongkai Sha
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Guizhi Dong
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Kemiao Hong
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Xinfang Xu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Wenhao Hu
- Guangdong Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- China
| |
Collapse
|
7
|
Sprague DJ, Johnston JN. Substituted Imidazoline Synthesis: A Diastereo- and Enantioselective aza-Henry Route to a Human Proteasome Modulator. Org Lett 2020; 22:8496-8499. [PMID: 33054232 DOI: 10.1021/acs.orglett.0c03096] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first enantio- and diastereoselective synthesis of Tepe's human proteasome modulator is described. Routes to this and other highly substituted chiral imidazolines generally produce racemic material. Key to the route disclosed here is a gram-scale anti-selective aza-Henry reaction of an α-alkyl α-nitro ester nucleophile, catalyzed by a Bis(Amidine) [BAM] chiral proton complex, delivering the key intermediate in high yield as a single stereoisomer. The adduct is reduced to the amino ester and converted to an imidazoline.
Collapse
Affiliation(s)
- Daniel J Sprague
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Jeffrey N Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| |
Collapse
|
8
|
Zhu WR, Liu K, Weng J, Huang WH, Huang WJ, Chen Q, Lin N, Lu G. Catalytic Asymmetric Synthesis of Vicinal Tetrasubstituted Diamines via Umpolung Cross-Mannich Reaction of Cyclic Ketimines. Org Lett 2020; 22:5014-5019. [DOI: 10.1021/acs.orglett.0c01578] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Wen-Run Zhu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, P.R. China
| | - Kai Liu
- Institute of Marine Drugs, Guangxi University of Chinese Medicine, Nanning 530200, P.R. China
| | - Jiang Weng
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, P.R. China
| | - Wei-Hua Huang
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, P.R. China
| | - Wei-Jie Huang
- College of Pharmacy, Guangxi Zhuang Yao Medicine Center of Engineering and Technology, Guangxi University of Chinese Medicine, Nanning 530200, P.R. China
| | - Qing Chen
- College of Pharmacy, Guangxi Zhuang Yao Medicine Center of Engineering and Technology, Guangxi University of Chinese Medicine, Nanning 530200, P.R. China
| | - Ning Lin
- College of Pharmacy, Guangxi Zhuang Yao Medicine Center of Engineering and Technology, Guangxi University of Chinese Medicine, Nanning 530200, P.R. China
| | - Gui Lu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, P.R. China
| |
Collapse
|
9
|
Affiliation(s)
- Sandra Abi Fayssal
- Université de Paris, UMR CNRS 8601, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, 45 rue des Saints-Pères, F-75006 Paris, France
| | - Alessandro Giungi
- Université de Paris, UMR CNRS 8601, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, 45 rue des Saints-Pères, F-75006 Paris, France
| | - Farouk Berhal
- Université de Paris, UMR CNRS 8601, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, 45 rue des Saints-Pères, F-75006 Paris, France
| | - Guillaume Prestat
- Université de Paris, UMR CNRS 8601, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, 45 rue des Saints-Pères, F-75006 Paris, France
| |
Collapse
|
10
|
Guan H, Cao X, Walsh PJ, Mao J. One-Pot Aminoalkylation of Aldehydes: Diastereoselective Synthesis of Vicinal Diamines with Azaarylmethylamines. Org Lett 2019; 21:8679-8683. [DOI: 10.1021/acs.orglett.9b03287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Haixing Guan
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P.R. China
| | - Xianzhong Cao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P.R. China
| | - Patrick J. Walsh
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Jianyou Mao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P.R. China
| |
Collapse
|
11
|
Abstract
A highly regio- and enantioselective synthesis of 1,2-diamine derivatives from γ-substituted allylic pivalamides using copper-catalyzed hydroamination is reported. The N-pivaloyl group is essential, in both facilitating the hydrocupration step and suppressing an unproductive β-elimination from the alkylcopper intermediate. This approach enables an efficient construction of chiral differentially protected vicinal diamines under mild conditions with broad functional group tolerance.
Collapse
Affiliation(s)
- Saki Ichikawa
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Xi-Jie Dai
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Stephen L Buchwald
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| |
Collapse
|
12
|
Affiliation(s)
- Xueli Cheng
- School of Chemistry and Chemical EngineeringTaishan University Tai'an Shandong China
| |
Collapse
|
13
|
Vishe M, Johnston JN. The inverted ketene synthon: a double umpolung approach to enantioselective β 2,3-amino amide synthesis. Chem Sci 2019; 10:1138-1143. [PMID: 30774911 PMCID: PMC6349014 DOI: 10.1039/c8sc04330b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 11/11/2018] [Indexed: 12/29/2022] Open
Abstract
A stereocontrolled synthesis of β2,3-amino amides is reported. Innovation is encapsulated by the first use of nitroalkenes to achieve double umpolung in enantioselective β-amino amide synthesis. Step economy is also fulfilled by the use of Umpolung Amide Synthesis (UmAS) in the second step, delivering the amide product without intermediacy of a carboxylic acid or activated derivative. Molybdenum oxide-mediated hydride reduction provides the anti-β2,3-amino amide with high selectivity.
Collapse
Affiliation(s)
- Mahesh Vishe
- Department of Chemistry , Vanderbilt Institute of Chemical Biology Vanderbilt University , Nashville , Tennessee 37235 , USA .
| | - Jeffrey N Johnston
- Department of Chemistry , Vanderbilt Institute of Chemical Biology Vanderbilt University , Nashville , Tennessee 37235 , USA .
| |
Collapse
|
14
|
Yang PJ, Qi L, Liu Z, Yang G, Chai Z. Lewis Acid Catalyzed Dynamic Kinetic Asymmetric Transformation of Racemic N-Sulfonylaziridines. J Am Chem Soc 2018; 140:17211-17217. [DOI: 10.1021/jacs.8b10217] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Pei-Jun Yang
- MOE Key Laboratory of Functionalized Molecular Solids, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Ling Qi
- MOE Key Laboratory of Functionalized Molecular Solids, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Zhen Liu
- MOE Key Laboratory of Functionalized Molecular Solids, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Gaosheng Yang
- MOE Key Laboratory of Functionalized Molecular Solids, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| | - Zhuo Chai
- MOE Key Laboratory of Functionalized Molecular Solids, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China
| |
Collapse
|
15
|
Affiliation(s)
- Daisuke Uraguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University
- CREST, Japan Science and Technology Agency (JST), Nagoya University
| |
Collapse
|
16
|
Shao X, Li K, Malcolmson SJ. Enantioselective Synthesis of anti-1,2-Diamines by Cu-Catalyzed Reductive Couplings of Azadienes with Aldimines and Ketimines. J Am Chem Soc 2018; 140:7083-7087. [PMID: 29775301 PMCID: PMC5999589 DOI: 10.1021/jacs.8b04750] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Here we report highly efficient and chemoselective azadiene-imine reductive couplings catalyzed by (Ph-BPE)Cu-H that afford anti-1,2-diamines. In all cases, reactions take place with either aldimine or ketimine electrophiles to deliver a single diastereomer of product in >95:5 er. The products' diamines are easily differentiable, facilitating downstream synthesis.
Collapse
Affiliation(s)
- Xinxin Shao
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Kangnan Li
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Steven J. Malcolmson
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| |
Collapse
|