Chemoenzymatic synthesis of enantiomerically pure alkene 1,2-diols and glycosides thereof
摘要:
The kinetic resolution of racemic 2-O-acylated 3-butene-1,2-diol and 1-O-acylated 3-butene-1,2-diol derivatives by enzymatic saponification and enzymatic esterification, respectively, is investigated with several lipases and esterases. The resulting partially blocked enantiomers are glycosylated with glycosyl halides and trichloroacetimidates, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved.
Copper-Catalyzed S<sub>N</sub>2′-Selective Allylic Substitution Reaction of <i>gem</i>-Diborylalkanes
作者:Zhen-Qi Zhang、Ben Zhang、Xi Lu、Jing-Hui Liu、Xiao-Yu Lu、Bin Xiao、Yao Fu
DOI:10.1021/acs.orglett.5b03692
日期:2016.3.4
A Cu/(NHC)-catalyzed SN2′-selective substitution reaction of allylic electrophiles with gem-diborylalkanes is reported. Different substituted gem-diborylalkanes and allylic electrophiles can be employed in this reaction, and various synthetic valuable functional groups can be tolerated. The asymmetric version of this reaction was initially researched with chiral N-heterocyclic carbene (NHC) ligands
报道了Cu /(NHC)催化的烯丙基亲电试剂与宝石-二硼烷基烷烃的S N 2'-选择性取代反应。在该反应中可以使用不同的取代的宝石-二硼烷基烷烃和烯丙基亲电子试剂,并且可以容许各种合成的有价值的官能团。最初使用手性N-杂环卡宾(NHC)配体研究了该反应的不对称形式。
[EN] PROCESS FOR PREPARING PYRIDINIUM FLUOROCHROMATE (VI)<br/>[FR] PROCEDE DE PREPARATION DE FLUOROCHROMATE (IV) DE PYRIDINIUM
申请人:COUNCIL SCIENT IND RES
公开号:WO2004054976A1
公开(公告)日:2004-07-01
The present invention relates to a novel, economic and environmentally clean process for pyridinium salt of fluorotrioxo-chromate (VI), PFC, having the chemical formula C5H5NH[CrO3F], by direct reaction of stoichiometric amounts of hydrofluoric acid, chromium trioxide and pyridine demonstrating approximately 100 % atom economy.
Process for preparing pyridinium fluorochromate (VI)
申请人:Council of Scientific and Industrial Research
公开号:US20040133003A1
公开(公告)日:2004-07-08
The present invention relates to a novel, economic and environmentally clean process for pyridinium salt of fluorotrioxo-chromate (VI), PFC, having the chemical formula C
5
H
5
NH[CrO
3
F], by direct reaction of stoichiometric amounts of hydrofluoric acid, chromium trioxide and pyridine demonstrating approximately 100% atom economy.