Designing New Chiral Ketone Catalysts. Asymmetric Epoxidation of <i>cis</i>-Olefins and Terminal Olefins
作者:Hongqi Tian、Xuegong She、Hongwu Yu、Lianhe Shu、Yian Shi
DOI:10.1021/jo010838k
日期:2002.4.1
class of chiral oxazolidinone ketone catalyst for asymmetric epoxidation. High ee values have been obtained for a number of cyclic and acyclic cis-olefins. The epoxidation was stereospecific with no isomerization observed in the epoxidation of acyclic systems. Encouragingly high ee values have also been obtained for a number of terminalolefins. Mechanistic studies show that electronic interactions play
Compounds containing oxazolidinone moiety and uses thereof
申请人:——
公开号:US20040039209A1
公开(公告)日:2004-02-26
A compound and method for producing an enantiomerically enriched epoxide from an olefin using a chiral ketone and an oxidizing agent is disclosed. In particular, the compound is of the formula: I wherein R
1
, R
2
, R
3
and R
4
are those defined herein.
Chiral acetals in organic synthesis: Regioselective synthesis of 2-and 3-hydroxy acetals from 2,3-olefinic acetals. Reinvestigation and further applications
作者:Yashwant D. Vankar、M.Venkatram Reddy、Narayan C. Chaudhuri
DOI:10.1016/s0040-4020(01)85714-8
日期:1994.1
Achiral as well as chiral 2,3-olefinic acetals are converted into 2- and 3- hydroxy acetals via LAH reduction of the corresponding epoxides and via bromohydrins followed by TBTH reductions respectively. Synthesis of 1,3-diones is described. Compounds from chiral systems are further utilized for asymmetric synthesis.
Regioselective reductions of 23-epoxy acetals with lithium aluminum hydride: A reinvestigation.
作者:Helena M.C. Ferraz、Regina M. Sasahara、Pellegrino Losco
DOI:10.1016/s0040-4039(00)74739-3
日期:1992.12
Treatment of 2,3-epoxy acetals with lithiumaluminumhydride gave the corresponding 2-hydroxy acetals, instead of the previously reported 3-hydroxy acetals.
用氢化铝锂处理2,3-环氧缩醛可得到相应的2-羟基缩醛,而不是先前报道的3-羟基缩醛。
Highly Enantioselective Epoxidation of <i>cis</i>-Olefins by Chiral Dioxirane
作者:Hongqi Tian、Xuegong She、Lianhe Shu、Hongwu Yu、Yian Shi