Diastereoselectivity control in the TiCl4-mediated addition reaction of allyltrimethylsilane to N,O-protected (l)-serinals
作者:Janusz Jurczak、Piotr Prokopowicz
DOI:10.1016/s0040-4039(98)02245-x
日期:1998.12
The TiCl4- and SnCl4-mediated addition reactions of allyltrimethylsilane (1) to protected (L)-serinals (2-5) were studied, and in the case of TiCl4, a large influence of the N- and O-protecting groups on the stereochemical course was observed. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Effective and mild method for preparation of optically active α-amino aldehydes via TEMPO oxidation
The TEMPO oxidation method is successfully applied to preparation of variously protected, opticallyactive α-amino aldehydes without racemization and in very good yield.
TEMPO氧化方法已成功地用于制备各种受保护的旋光性α-氨基醛,且不发生外消旋作用,并且收率很高。
The stereochemical course of addition of allyltrimethylsilane to protected l-alaninals and l-serinals in the presence of Lewis acids. Total synthesis of cis-(2R,3S)-3-hydroxyproline
作者:D. Gryko、P. Prokopowicz、J. Jurczak
DOI:10.1016/s0957-4166(02)00255-0
日期:2002.6
l-alaninals and l-serinals was investigated and high levels of asymmetric induction were achieved. Stereochemical models for rationalisation of the results obtained are proposed. cis-(2R,3S)-3-Hydroxyproline was synthesised starting from N-Cbz,O-TBS-l-serinal, in which the crucial step involves addition of allyltrimethylsilane to the aldehyde in the presence of SnCl4.