Asymmetric cycloaddition of anthrone with N-substituted maleimides with C2-chiral pyrrolidines
摘要:
Base-catalyzed asymmetric cycloaddition of anthrone with achiral and chiral N-substituted maleimides was carried out in the presence of C-2-chiral pyrrolidines in almost quantitative yields. Chiral, non-racemic [4+2] adducts up to 61% ee were produced with achiral N-methyl and N-benzylmaleimide using the chiral catalysts. De's of the adducts up to 38% were observed in the cases of chiral N-substituted maleimides and achiral pyrrolidine, in which the absolute configuration of the major product was established by X-ray analysis. The combination of chiral maleimides and chiral catalysts afforded the adducts having up to 80% de. (C) 1997 Published by Elsevier Science Ltd. All rights reserved.
A Formal [3 + 3] Cycloaddition Reaction. 5. An Enantioselective Intramolecular Formal Aza-[3 + 3] Cycloaddition Reaction Promoted by Chiral Amine Salts
作者:Aleksey I. Gerasyuto、Richard P. Hsung、Nadiya Sydorenko、Brian Slafer
DOI:10.1021/jo050171s
日期:2005.5.1
A detailed account on chiral secondary amine salt promoted enantioselective intramolecular formal aza-[3 + 3] cycloadditions is described here for the first time. The dependence of enantioselectivity on the structural feature of these chiral amines is thoroughly investigated. This study also reveals a very interesting reversal of the stereochemistry in the respective cycloadducts obtained using C-1- and C-2-symmetric amine salts. In addition, the influence of solvents, counteranions, and temperatures on the enantioselectivity is described, and a unified mechanistic model based on experimental results as well as semiempirical calculations is proposed.
Versatile Synthesis of Enantiomerically Pure trans-2,5-Disubstituted Pyrrolidines
作者:N. André Sasaki、Michael Dockner、Pierre Potier
DOI:10.3987/com-95-s89
日期:——
[EN] AZA-TETRACYCLIC OXAZEPINE COMPOUNDS AND USES THEREOF<br/>[FR] COMPOSÉS D'OXAZÉPINE AZA-TÉTRACYCLIQUES ET LEURS UTILISATIONS
申请人:[en]GENENTECH, INC.
公开号:WO2023225302A1
公开(公告)日:2023-11-23
Provided herein are aza-tetracyclic oxazepinyl compounds useful in the treatment of cancers.