An efficient totalsynthesis of (−)-epothilone B has been achieved in ca. 8% yield over 11 steps from 9 (or 10 steps from 7/8), which features a bissiloxane-tethered ring closing metathesis reaction to approach the trisubstituted (Z) double bond and forms a new basis for further development of an industrial process for epothilone B and ixabepilone.
Total Synthesis and Selective Activity of a New Class of Conformationally Restrained Epothilones
作者:Mamoun M. Alhamadsheh、Shuchi Gupta、Richard A. Hudson、Lalith Perera、L. M. Viranga Tillekeratne
DOI:10.1002/chem.200701143
日期:2008.1.7
Stereoselective total syntheses of two novel conformationally restrained epothiloneanalogues are described. Evans asymmetric alkylation, Brown allylation, and a diastereoselective aldol reaction served as the key steps in the stereoselective synthesis of one of the two key fragments of the convergent synthetic approach. Enzyme resolution was employed to obtain the second fragment as a single enantiomer
Intermediates in the process for preparing epothilones
申请人:Novartis AG
公开号:US06043372A1
公开(公告)日:2000-03-28
The invention relates to a process for the production of epothilones and intermediate products within the process. Epothilones A and B are natural substances, which can be produced by microorganisms, and the taxols have similar properties and are thus of particular interest in pharmaceutical chemistry.
Epothilone analogues include a molecular scaffold which holds at least one segment of epothilone in a predetermined orientation and which rigidities a region between the macrolactone ring and the aromatic side-chain.
Epothilone analogues include a molecular scaffold which holds at least one segment of epothilone in a predetermined orientation and which rigidities a region between the macrolactone ring and the aromatic side-chain.