Asymmetric synthesis of di- and trisubstituted pyrrolidinones via zirconium-mediated intramolecular coupling of N-3-alkenyl carbamates
摘要:
N-3-Alkenyl carbamates, which are readily available in enantiomerically pure form, undergo a stereoselective intramolecular coupling under the effect of a Cp2ZrCl2/2n-BuLi reagent. The influence of the carbamate structure on the stereoselectivity was tested. The reaction gives an easy access to various di-and trisubstituted enantiopure pyrrolidinones. (c) 2007 Elsevier Ltd. All rights reserved.
Synthesis of azetidines and pyrrolidines via iodocyclisation of homoallyl amines and exploration of activity in a zebrafish embryo assay
作者:Antonio Feula、Sundeep S. Dhillon、Rama Byravan、Mandeep Sangha、Ronald Ebanks、Mariwan A. Hama Salih、Neil Spencer、Louise Male、Istvan Magyary、Wei-Ping Deng、Ferenc Müller、John S. Fossey
DOI:10.1039/c3ob41007b
日期:——
deliver stable methylamino azetidine derivatives. With subtle changes to the reaction sequences homoallyl amines could be stereoselectively converted to either cis- or trans-substituted 3-amino pyrrolidine derivatives at will. The stereochemical divergent synthesis of cis and trans substituted pyrrolidines supports an ion part, aziridinium, isomerisation pathway for azetidine to pyrrolidine isomerisation
Allylation of Imines with Samarium/Allyl Bromide System
作者:Junquan Wang Yongmin Zhang、Weiliang Bao
DOI:10.1080/00397919608004559
日期:1996.7
Abstract Imines can be readily allylated with samarium/allylbromide system to afford homoallylamines in satisfactory yields in THF under mild conditions.
Allylic Tantalums as Highly Imine-Selective Reagents
作者:Ikuya Shibata、Kyo Nose、Kazuya Sakamoto、Makoto Yasuda、Akio Baba
DOI:10.1021/jo0356659
日期:2004.3.1
A pratical method for the allylation of low electrophilic N-aliphatic imines was established by allylic tantalum. This is a superior methodology compared with conventional ones in terms of wide applicability to imines.
Asymmetric synthesis of di- and trisubstituted pyrrolidinones via zirconium-mediated intramolecular coupling of N-3-alkenyl carbamates
N-3-Alkenyl carbamates, which are readily available in enantiomerically pure form, undergo a stereoselective intramolecular coupling under the effect of a Cp2ZrCl2/2n-BuLi reagent. The influence of the carbamate structure on the stereoselectivity was tested. The reaction gives an easy access to various di-and trisubstituted enantiopure pyrrolidinones. (c) 2007 Elsevier Ltd. All rights reserved.
Chiral π-Allylpalladium-Catalyzed Asymmetric Allylation of Imines: Replacement of Allylstannanes by Allylsilanes