Intermediates for the synthesis of epothilones and methods for their preparation
申请人:Novartis AG
公开号:US06350878B1
公开(公告)日:2002-02-26
The invention relates to a method of synthesis for a compound of formula (I),
wherein R is a heterocyclyl moiety and X1, X2, X3 and X4 are, independently of each other, protecting groups, which is appropriate for the synthesis of epothilone B and desoxyepothione B.
Flexible Routes to the 5-Hydroxy Acid Fragment of the Cryptophycins
作者:Prodeep Phukan、Sanjita Sasmal、Martin E. Maier
DOI:10.1002/ejoc.200210695
日期:2003.5
Two solutions to establishing the anti stereochemistry of the vicinal stereocenters in the 5-hydroxy acid subunit of cryptophycin, based on initial Evans syn aldol reactions between an N-(propionyl)oxazolidinone 4 and a C3 aldehyde, were developed. In the first route, the secondary hydroxy group was inverted by use of Mitsunobu reaction conditions, whereas the second route features an inversion of
A general strategy has been devised for the stereoselective synthesis of 12,13-cyclopropyl-epothilone B and side-chain-modified variants thereof, which relies on late stage introduction of the heterocycle through Wittig olefination of ketone 14. Formation of the macrocycle was achieved through RCM-based ring closure and introduction of the cyclopropane moiety involved a highly selective Charette cyclopropanation of allylic alcohol 7.
A Total Synthesis of Epothilones Using Solid-Supported Reagents and Scavengers
作者:R. Ian Storer、Toshiyasu Takemoto、Philip S. Jackson、Steven V. Ley