The titanium-catalysed epoxidation of homoallylic α-amino alcohols
摘要:
Diastereoselective titanium-catalysed epoxidation reactions of acyclic homoallylic alcohols are presented. The results are compared to the stereochemical outcome obtained by the application of the commonly used vanadium catalyst, VO(acac)(2). The key role of the syn-bis-homoallylic carbamate group in obtaining high yields and reversed diastereoselectivities in the titanium-catalysed reactions is discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
Dramatic changes in diastereoselectivity with the quantity of titanium tetrachloride used in Lewis acid mediated reactions of allylsilane with .alpha.-amino aldehydes
Facile, Stereocontrolled Synthetic Route towards Bis-functionalised Pyrrolizidines
作者:Janusz Jurczak、Marcin Lindner、Antoni Krasiński
DOI:10.1055/s-0037-1609582
日期:2018.11
Ligands, and Targets Abstract A simple and convenient method for the synthesis of bis-functionalised pyrrolizidines starting from readily available N-Cbz-l-prolinal is described. This aldehyde was converted within two concise steps to the corresponding aminoepoxides, which were separately subjected to regioselective cyclisation induced by a reductive cleavage of the Cbz protecting group. The versatile
The titanium-catalysed epoxidation of homoallylic α-amino alcohols
作者:Antoni Krasiński、Janusz Jurczak
DOI:10.1016/s0957-4166(02)00511-6
日期:2002.10
Diastereoselective titanium-catalysed epoxidation reactions of acyclic homoallylic alcohols are presented. The results are compared to the stereochemical outcome obtained by the application of the commonly used vanadium catalyst, VO(acac)(2). The key role of the syn-bis-homoallylic carbamate group in obtaining high yields and reversed diastereoselectivities in the titanium-catalysed reactions is discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.