Unexpected aldol condensations under Williamson arylmethyl ether synthesis conditions
摘要:
Good yields of aldols, formed by reaction of the solvent acetone with some selected phenolic aldehydes, were obtained under Williamson arylmethyl ether conditions (Me2SO4 and K2CO3 in acetone). (C) 1998 Elsevier Science Ltd. All rights reserved.
A simple and highly stereoselective method has been developed for the synthesis of E-configured α,β-unsaturatedketones using gallium(III) chloride as a novel catalyst. This new procedure offers significant advantages such as high conversions, short reaction times and enhanced E-selectivity together with mild reaction conditions.
已经开发了一种简单且高度立体选择性的方法,用于使用氯化镓 (III) 作为新型催化剂合成 E 构型的 α,β-不饱和酮。这种新方法具有显着的优势,例如高转化率、短反应时间和增强的 E 选择性以及温和的反应条件。
Unexpected aldol condensations under Williamson arylmethyl ether synthesis conditions
作者:Ana L. Silva、Beatriz Quiroz、Luis A. Maldonado
DOI:10.1016/s0040-4039(98)00186-5
日期:1998.4
Good yields of aldols, formed by reaction of the solvent acetone with some selected phenolic aldehydes, were obtained under Williamson arylmethyl ether conditions (Me2SO4 and K2CO3 in acetone). (C) 1998 Elsevier Science Ltd. All rights reserved.
A Chiral Electrophilic Selenium Reagent To Promote the Kinetic Resolution of Racemic Allylic Alcohols
[reaction: see text] The first example of a kineticresolution process promoted by electrophilic selenium reagents is reported. Racemic allylic alcohols react with half equivalents of a selenenylating agent in methanol leading to the regiospecific formation of the corresponding addition products with a very high level of facial selectivity (from 95:5 to 98:2 dr). The unreacted alcohols can be recovered