Amphiphilic reactions by means of exceptionally bulky organoaluminum reagents. Rational approach for obtaining unusual equatorial, anti-Cram, and 1,4 selectivity in carbonyl alkylation
The introduction of electronegative substituents onto the silyl group of triaryl(2-silylethylidene)phosphorane promotes eliminative silyl migration relative to the Wittig reaction; the combination of this effect with modification of the phosphorane substituents leads to highly diastereoselective reagents for alkenylation.
Les acylsilanes α-chiraux montrent des preferences diastereofaciales exceptionnelles dans des additions nucleophiles qui sont suivies d'une protodesilylation par l'anion F − pour donner des alcools secondaires
Les acylresidents α-chiraux montrent des preference diastereofaciales exceptionnelles dans des addeds nucleophiles quisont suivies d'une protodesilylation par l'anion F − pour donner des alcools secondaires
[EN] IMPROVEMENTS IN OR RELATING TO ORGANIC COMPOUNDS<br/>[FR] PERFECTIONNEMENTS APPORTÉS OU SE RAPPORTANT À DES COMPOSÉS ORGANIQUES
申请人:GIVAUDAN SA
公开号:WO2019238568A1
公开(公告)日:2019-12-19
Disclosed is a compound represented by formula (I). The half-doted double lines each represent a carbon-carbon single bond or a carbon-carbon double bond. The six-membered ring comprises exactly one endocyclic carbon-carbon double bond or exactly two endocyclic carbon-carbon double bonds. When the six-membered ring comprises exactly two endocyclic carbon-carbon double bonds, the endocyclic carbon-carbon double bonds are either in 1,3-relationship or in 1,4-relationship. R is selected from the group consisting of iso-propyl, iso-butyl, sec-butyl and tert-butyl.
Revisiting the Corey–Chaykovsky reaction: the solvent effect and the formation of β-hydroxy methylthioethers
作者:Yu Peng、Jin-Hui Yang、Wei-Dong Z. Li
DOI:10.1016/j.tet.2005.10.068
日期:2006.2
The classical Corey-Chaykovsky (CC) reaction of ketones in ethereal solvents (i.e., THF or Et2O) resulted in the production of a 14 significant amount of P-hydroxy methylthioether 2 along with normal epoxide product 1. Some interesting and synthetically useful transformations of the CC reaction product of cyclopropyl ketones were also described. (c) 2005 Elsevier Ltd. All rights reserved.
TSUKAMOTO MASAMITSU; LIO HIDEO; TOKOROYAMA TAKASHI, J. CHEM. SOC. CHEM. DOMMUN.,(1986) N 11, 880-882