1
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Yu PC, Karmakar A, Sabbers WA, Shajan F, Andrade RB. Asymmetric Total Synthesis of (+)-Epiibogamine Enabled by Three-Component Domino Michael/Michael/Mannich Annulation of N-Sulfinyl Metallosilylenamines. Org Lett 2023; 25:956-960. [PMID: 36729497 DOI: 10.1021/acs.orglett.2c04287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The iboga alkaloids are promising antiaddictive and neuroregeneration candidates for medical treatment. There is a lack of studies for C20-epi iboga alkaloids due to the synthetic difficulties. Herein we report the shortest total synthesis of (+)-epiibogamine in seven steps from trimethyl orthobutyrate. The novel N-sulfinyl silylenamine reagent enabled the key step, with three-component domino Michael/Michael/Mannich annulation providing the 1-amino-2,4-diester scaffold with four new chiral centers, and access to the isoquinuclidine in high yield (84%) and diastereoselectivity (>95:5 dr).
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Affiliation(s)
- Po-Cheng Yu
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Anupam Karmakar
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - William A Sabbers
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Femil Shajan
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Rodrigo B Andrade
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
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2
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Feng J, Liu H, Yao Y, Lu CD. Mannich-Type Reaction of α-Sulfanyl N- tert-Butanesulfinylimidates: Diastereoselective Access to α-Mercapto-β-amino Acid Derivatives. J Org Chem 2021; 86:3049-3058. [PMID: 33507079 DOI: 10.1021/acs.joc.0c02583] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of α-mercapto-β-amino acid derivatives were synthesized diastereoselectively in good yields through the aza-enolization of α-sulfanyl N-tert-butanesulfinylimidates, followed by their nucleophilic addition to N-tosyl imines via a Mannich-type reaction. The resulting derivatives bearing a β-sulfonylamino sulfide moiety participated in further inter- and intramolecular transformations involving episulfonium ion intermediates generated through neighboring-group participation.
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Affiliation(s)
- Jie Feng
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Yun Yao
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
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3
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McDaniel J, Farley CA, Ramirez A, Sandhu B, Sarjeant A, Shi Q, Han A, Gallagher WP, Hynes J, Dhar TGM, Gonzalez-Bobes F, Coombs JR, Marcoux D. Discovery of Annulating Reagents Enabling the One-Step and Highly Stereoselective Synthesis of Cyclopentyl and Cyclohexyl Cores. Org Lett 2021; 23:60-65. [PMID: 33351641 DOI: 10.1021/acs.orglett.0c03695] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The use of the unprecedented annulating reagents methyl N-(tert-butylsulfinyl)-4-chlorobutanimidate and methyl N-(tert-butylsulfinyl)-5-bromopentanimidate enables the diastereoselective preparation of 5- and 6-membered carbocycles bearing three contiguous stereocenters. These synthons undergo cycloaddition with a variety of Michael acceptors to form cyclopentane/cyclohexane rings with excellent stereochemical control, generating only one of the eight possible diastereomers. This novel methodology has enabled the highly enantioselective and high yielding synthesis of novel chemotypes of pharmacological relevance.
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Affiliation(s)
- Jade McDaniel
- Department of Discovery Chemistry, Bristol Myers Squibb, 3551 Lawrenceville Road, Princeton, New Jersey 08540, United States
| | - Christopher A Farley
- Department of Discovery Chemistry, Bristol Myers Squibb, 3551 Lawrenceville Road, Princeton, New Jersey 08540, United States
| | - Antonio Ramirez
- Chemical Process Development, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Bhupinder Sandhu
- Material Science & Engineering, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Amy Sarjeant
- Material Science & Engineering, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Qing Shi
- Department of Discovery Chemistry, Bristol Myers Squibb, 3551 Lawrenceville Road, Princeton, New Jersey 08540, United States
| | - Arthur Han
- Chemical Process Development, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - William P Gallagher
- Chemical Process Development, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - John Hynes
- Department of Discovery Chemistry, Bristol Myers Squibb, 3551 Lawrenceville Road, Princeton, New Jersey 08540, United States
| | - T G Murali Dhar
- Department of Discovery Chemistry, Bristol Myers Squibb, 3551 Lawrenceville Road, Princeton, New Jersey 08540, United States
| | - Francisco Gonzalez-Bobes
- Chemical Process Development, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - John R Coombs
- Chemical Process Development, Bristol Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - David Marcoux
- Department of Discovery Chemistry, Bristol Myers Squibb, 3551 Lawrenceville Road, Princeton, New Jersey 08540, United States
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4
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Philip RM, Radhika S, Saranya PV, Anilkumar G. Applications of tert-butanesulfinamide in the synthesis of N-heterocycles via sulfinimines. RSC Adv 2020; 10:42441-42456. [PMID: 35516764 PMCID: PMC9058287 DOI: 10.1039/d0ra08819f] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 11/16/2020] [Indexed: 01/26/2023] Open
Abstract
Chiral sulfinamides are among the best known chiral auxiliaries in the stereoselective synthesis of amines and their derivatives. The most extensively used enantiopure tert-butanesulfinamide emerged as the gold standard among many others over the last two decades. The present review attempts to provide an overview of tert-butanesulfinamide mediated asymmetric N-heterocycle synthesis via sulfinimines and covers literature from 2010-2020. This methodology offers general access to structurally diverse piperidines, pyrrolidines, azetidines, and their fused derivatives that represent the structural motif of many natural products and therapeutically applicable compounds.
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Affiliation(s)
- Rose Mary Philip
- School of Chemical Sciences, Mahatma Gandhi University Priyadarsini Hills P O Kottayam Kerala 686560 India +91-481-2731036
| | - Sankaran Radhika
- School of Chemical Sciences, Mahatma Gandhi University Priyadarsini Hills P O Kottayam Kerala 686560 India +91-481-2731036
| | - P V Saranya
- School of Chemical Sciences, Mahatma Gandhi University Priyadarsini Hills P O Kottayam Kerala 686560 India +91-481-2731036
| | - Gopinathan Anilkumar
- School of Chemical Sciences, Mahatma Gandhi University Priyadarsini Hills P O Kottayam Kerala 686560 India +91-481-2731036
- Advanced Molecular Materials Research Centre (AMMRC), Mahatma Gandhi University Priyadarsini Hills P O Kottayam Kerala 686560 India
- Institute for Integrated Programmes and Research in Basic Sciences (IIRBS), Mahatma Gandhi University Priyadarsini Hills P O Kottayam Kerala 686560 India
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5
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Wang H, Tian D, Meng Z, Chen Z, Xue F, Liu XY, Song H, Qin Y. Synthetic progress toward the marine natural product zamamiphidin A. RSC Adv 2020; 10:11903-11906. [PMID: 35496609 PMCID: PMC9050630 DOI: 10.1039/d0ra01580f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 03/18/2020] [Indexed: 11/21/2022] Open
Abstract
An asymmetric synthetic approach to the octahydrofuro[3,4-b]pyridine framework of marine natural product zamamiphidin A has been described. The key steps include an asymmetric Michael addition of (R)-N-tert-butanesulfinyl imidate with enamidomalonate to install the C10 stereocenter, an intramolecular alkoxide exchange/Michael addition/hydrogenation sequence to construct the bicyclic ring system. An asymmetric synthetic approach to the octahydrofuro[3,4-b]pyridine framework of marine natural product zamamiphidin A has been described.![]()
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Affiliation(s)
- Hao Wang
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University Chongqing 401331 P. R. China
| | - Di Tian
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug, Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 P. R. China
| | - Zhaoxiang Meng
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug, Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 P. R. China
| | - Zhihao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug, Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 P. R. China
| | - Fei Xue
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug, Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 P. R. China
| | - Xiao-Yu Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug, Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 P. R. China
| | - Hao Song
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug, Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 P. R. China
| | - Yong Qin
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug, Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University Chengdu 610041 P. R. China
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6
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Li ZF, Yao Y, Xu YJ, Lu CD. Diastereoselective α-Amination of N- tert-Butanesulfinyl Imidates Using N-Aryl- N-diphenylphosphinyldiazenes. J Org Chem 2019; 84:7207-7218. [PMID: 31070913 DOI: 10.1021/acs.joc.9b00877] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diastereoselective α-amination of N- tert-butanesulfinyl imidates has been developed using N-aryl (or N- tert-butyl) N-diphenylphosphinyldiazenes as nitrogen sources. The chiral 1-azaenolates derived from imidates undergo nucleophilic addition with diazenes to give α-hydrazino imidates in good yields.
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Affiliation(s)
- Zheng-Fei Li
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry , Chinese Academy of Sciences , Urumqi 830011 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Yun Yao
- School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry , Chinese Academy of Sciences , Urumqi 830011 , China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry , Chinese Academy of Sciences , Urumqi 830011 , China.,School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China
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7
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Tang F, Ma PJ, Yao Y, Xu YJ, Lu CD. Divergent synthesis of polysubstituted cyclopropanes and β-silyoxy imidates via switchable additions of N-tert-butanesulfinylimidates to acylsilanes. Chem Commun (Camb) 2019; 55:3777-3780. [DOI: 10.1039/c9cc00963a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A switchable addition of N-tert-butanesulfinylimidates to acylsilanes leads to divergent synthesis of polysubstituted cyclopropanes and β-silyloxy imidates.
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Affiliation(s)
- Fan Tang
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Peng-Ju Ma
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Yun Yao
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
- China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
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8
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Huang W, Yao Y, Xu YJ, Lu CD. Diastereoselective α-Fluorination of N- tert-Butanesulfinyl Imidates. J Org Chem 2018; 83:14777-14785. [PMID: 30407820 DOI: 10.1021/acs.joc.8b02375] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A diastereoselective α-fluorination of N- tert-butanesulfinyl imidates was developed. Deprotonation of N- tert-butanesulfinyl imidates with lithium hexamethyldisilazide generates aza-enolates that can be intercepted, with excellent diastereocontrol, by the inexpensive electrophilic fluorinating agent NFSI. This protocol was applied to the preparation of synthetically useful trans-2-fluoro-cyclohexamine with high enantiomeric purity (99.5% ee).
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Affiliation(s)
- Wei Huang
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Urumqi 830011 , China
| | - Yun Yao
- School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Urumqi 830011 , China
| | - Chong-Dao Lu
- School of Chemical Science and Technology , Yunnan University , Kunming 650091 , China.,Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Urumqi 830011 , China
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9
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Niu ST, Liu H, Xu YJ, Lu CD. Diastereoselective α-Sulfenylation of N- tert-Butanesulfinyl Imidates. J Org Chem 2018; 83:10580-10588. [PMID: 30010340 DOI: 10.1021/acs.joc.8b01403] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A diastereoselective α-sulfenylation of chiral α-aryl/alkyl N- tert-butanesulfinyl imidates has been developed. Suitable sulfur electrophiles can be used as sulfenylating reagents to intercept aza-enolates generated from imidate deprotonation, giving α-thiofunctionalized imidates in good yields with high diastereocontrol. This protocol for C-S bond formation can efficiently synthesize enantioenriched 1,2-sulfanyl amine derivatives such as sulconazole.
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Affiliation(s)
- Sheng-Tong Niu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones , Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011 , China.,University of the Chinese Academy of Sciences , Beijing 100049 , China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones , Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011 , China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones , Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011 , China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones , Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011 , China
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10
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Feng J, Ma PJ, Zeng YM, Xu YJ, Lu CD. Construction of α-methoxyimidoyl ketonitrones via phosphite-mediated addition of α-keto N-tert-butanesulfinyl imidates to nitrosoarenes. Chem Commun (Camb) 2018; 54:2882-2885. [PMID: 29493693 DOI: 10.1039/c8cc00345a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A dimethyl phosphite-mediated addition of α-keto N-tert-butanesulfinyl imidates to nitrosoarenes was developed. Nitrosoarenes were successfully used as electrophiles to trap aza-enolate intermediates that were generated from nucleophilic addition of deprotonated phosphite to α-keto N-tert-butanesulfinyl imidates and following phospha-Brook rearrangement, allowing efficient construction of ketonitrones with excellent (Z)-geometries.
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Affiliation(s)
- Jie Feng
- Department of Chemistry and Applied Chemistry, Changji University, Changji 831100, China.
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11
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Ma PJ, Liu H, Xu YJ, Aisa HA, Lu CD. Diastereoselective α-Hydroxylation of N-tert-Butanesulfinyl Imidates and N'-tert-Butanesulfinyl Amidines with Molecular Oxygen. Org Lett 2018; 20:1236-1239. [PMID: 29405721 DOI: 10.1021/acs.orglett.8b00178] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diastereoselective α-hydroxylation using molecular oxygen has been achieved with chiral α-alkyl N-tert-butanesulfinyl imidates and α-aryl N'-tert-butanesulfinyl amidines. The aza-enolates generated from deprotonation of imidates/amidines can be intercepted by O2 with excellent diastereocontrol and subsequently transformed into α-hydroxylation products in the presence of the reductant trimethyl phosphite.
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Affiliation(s)
- Peng-Ju Ma
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China.,University of Chinese Academy of Sciences , Beijing 100049, China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Haji Akber Aisa
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
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12
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Kaya U, Chauhan P, Mahajan S, Deckers K, Valkonen A, Rissanen K, Enders D. Squaramide-Catalyzed Asymmetric aza-Friedel-Crafts/N,O-Acetalization Domino Reactions Between 2-Naphthols and Pyrazolinone Ketimines. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709224] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Uğur Kaya
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Pankaj Chauhan
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Suruchi Mahajan
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Kristina Deckers
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Arto Valkonen
- Department of Chemistry, Nanoscience Center; University of Jyvaskyla; 40014 JYU Finland
| | - Kari Rissanen
- Department of Chemistry, Nanoscience Center; University of Jyvaskyla; 40014 JYU Finland
| | - Dieter Enders
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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13
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Kaya U, Chauhan P, Mahajan S, Deckers K, Valkonen A, Rissanen K, Enders D. Squaramide-Catalyzed Asymmetric aza-Friedel-Crafts/N,O-Acetalization Domino Reactions Between 2-Naphthols and Pyrazolinone Ketimines. Angew Chem Int Ed Engl 2017; 56:15358-15362. [DOI: 10.1002/anie.201709224] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Indexed: 12/12/2022]
Affiliation(s)
- Uğur Kaya
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Pankaj Chauhan
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Suruchi Mahajan
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Kristina Deckers
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Arto Valkonen
- Department of Chemistry, Nanoscience Center; University of Jyvaskyla; 40014 JYU Finland
| | - Kari Rissanen
- Department of Chemistry, Nanoscience Center; University of Jyvaskyla; 40014 JYU Finland
| | - Dieter Enders
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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14
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Li CT, Liu H, Xu YJ, Lu CD. Aldol Reaction of N-tert-Butanesulfinyl Imidates under Basic Conditions for Diastereoselective Synthesis of anti-Aldols. J Org Chem 2017; 82:11253-11261. [PMID: 28926692 DOI: 10.1021/acs.joc.7b01982] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Diastereoselective aldol reaction of N-tert-butanesulfinyl imidates under typical hard enolization conditions is reported. Potassium bis(trimethylsilyl)amide (KHMDS) effectively promotes the aldol reaction of α-aryl- and α-alkyl-substituted imidates, providing anti-aldol adducts in high yields with good to excellent diastereoselectivities. In the case of α-aryl imidates, high conversion depends on adding trimethylsilyl chloride (TMSCl) to the reaction mixture. In the presence of a suitable Lewis acid, cyclohexanone is a good electrophile in the aldol reaction of imidates.
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Affiliation(s)
- Chun-Tian Li
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China.,University of the Chinese Academy of Sciences , Beijing 100049, China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
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15
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Ma PJ, Liu H, Lu CD, Xu YJ. Diastereoselective Electrophilic α-Hydroxyamination of N-tert-Butanesulfinyl Imidates. Org Lett 2017; 19:670-673. [PMID: 28093907 DOI: 10.1021/acs.orglett.6b03835] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Diastereoselective α-hydroxyamination of N-tert-butanesulfinyl imidates using nitrosoarenes is reported. A catalytic amount of base effectively promotes the hydroxyamination reaction of α-aryl-substituted imidates, and the resulting α-hydroxyamino imidates can be transformed into a range of synthetically useful intermediates.
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Affiliation(s)
- Peng-Ju Ma
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China.,University of Chinese Academy of Sciences , Beijing 100049, China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
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16
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Huang W, Liu H, Lu CD, Xu YJ. Diastereoselective synthesis of 2-methoxyimidoyloxiranes via dimethyl phosphite-mediated coupling of α-keto N-sulfinyl imidates with aldehydes. Chem Commun (Camb) 2016; 52:13592-13595. [DOI: 10.1039/c6cc07723d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A dimethyl phosphite-triggered coupling of α-keto N-tert-butylsulfinyl imidates with aldehydes provides access to enantioenriched 2-methoxyimidoyloxiranes with excellent diastereoselectivities.
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Affiliation(s)
- Wei Huang
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones
- Xinjiang Technical Institute of Physics & Chemistry
- Chinese Academy of Sciences
- Urumqi 830011
- China
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