Optically active epoxides and a process for the production thereof
申请人:CHISSO CORPORATION
公开号:EP0515142A1
公开(公告)日:1992-11-25
The process comprises reacting alkenyl ethylene glycols with 0.5 to 2.0 equivalents of a titanium-tetraalkoxide, a peroxide and an L-(+)- or D-(-)-dialkyl tartrate at a temperature of -78° to 50°C to oxidize the alkenyl ethylene glycol asymmetrically. The process of the present invention is an excellent method for producing chiral epoxides in which steric configuration of three asymmetric points can be perfectly controlled, the reaction is performed by mild conditions and the chemical yield and the optical yield are extremely high. The optically active epoxides which can be efficiently produced by the production of the present invention are useful as stating materials of several kinds of compounds. The invention also provides a member of specific optically ctive epoxides.
Stereocontrolled synthesis of novel 6′(α)-hydroxy carbovir analogues
作者:Joon Hee Hong、Chang-Hyun Oh、Jung-Hyuck Cho
DOI:10.1016/s0040-4020(03)00986-4
日期:2003.8
This paper describes the racemic and stereoselective synthetic route for a novel6′(α)-hydroxy-carbovir from a simple acyclic precursor, Solketal. The relative stereochemistry of the target nucleosides was successfully controlled by a sequential stereoselective glycolate Claisen rearrangement followed by a ring-closing metathesis (RCM). Adenine and cytosine were coupled using a Pd(0) catalyzed allylic