A Diacetate Ketone-Catalyzed Asymmetric Epoxidation of Olefins
作者:Bin Wang、Xin-Yan Wu、O. Andrea Wong、Brian Nettles、Mei-Xin Zhao、Dajun Chen、Yian Shi
DOI:10.1021/jo900330n
日期:2009.5.15
A fructose-derived diacetate ketone has been shown to be an effective catalyst for asymmetricepoxidation. High ee values have been obtained for a variety of trans and trisubstituted olefins including electron-deficient α,β-unsaturated esters as well as certain cis olefins.
果糖衍生的二乙酸酮已被证明是不对称环氧化的有效催化剂。各种反式和三取代烯烃(包括缺电子 α,β-不饱和酯以及某些顺式烯烃)都获得了高 ee 值。
3- and 4-Uloses Derived from N-Acetyl-D-glucosamine: A Unique Pair of Complementary Organocatalysts for Asymmetric Epoxidation of Alkenes
作者:Christof Schöberl、Volker Jäger
DOI:10.1002/adsc.201100735
日期:2012.3.16
The 4‐ulose and the 3‐ulose, both derived in two steps from the α‐methyl glycoside of N‐acetyl‐D‐glucosamine (GlcNAc), act as organocatalysts in the asymmetricepoxidation of alkenes, with unprecedented complementary enantioselectivity. The best results are found with α,β‐unsaturated esters as substrates, with enantiomeric ratios up to 90:10 and 11:89, respectively.
An object of the present invention is to provide an auxin biosynthesis inhibitor superior to L-AOPP. The object can be attained by a compound represented by general formula (I): wherein, R
1
to R
5
and X are the same as defined in the specification or a salt or solvate thereof.
US9259000B2
申请人:——
公开号:US9259000B2
公开(公告)日:2016-02-16
Highly Enantioselective Epoxidation of α,β-Unsaturated Esters by Chiral Dioxirane
作者:Xin-Yan Wu、Xuegong She、Yian Shi
DOI:10.1021/ja020478y
日期:2002.7.1
This paper describes a highly enantioselective epoxidation of α,β-unsaturated esters using the fructose-derived ketone 2 as catalyst and Oxone as oxidant. High ee's have been obtained for a number of trans and trisubstituted substrates (82−98% ee). The results described show that it is feasible for dioxiranes to effectively epoxidize electron-deficientolefins with high ee's.