An efficient stereoselectiveformalsynthesis of marine derived monocyclic ether (−)-brevisamide is reported. The key steps involved in this synthesis are syn-Aldol reaction, Sharpless asymmetric epoxidation, and stereoselective construction of tetrahydropyran ring by 6-endo-cyclization of suitably substituted hydroxy styrylepoxide.
Tricyclic bromoether17, which contained twenty of thirty carbons of thyrsiferol (1d), was synthesized in optically active form starting from trivial compounds2 and3.
A novel highly stereoselective total synthesis of epothilone B and of its (12R,13R) acetonide
作者:Johann Mulzer、Gunter Karig、Peter Pojarliev
DOI:10.1016/s0040-4039(00)01318-6
日期:2000.9
Stereoselectivesyntheses of epothiloneB (1) and its novel derivative 2 are described. Key steps are the formation of intermediate 3 via Sharpless AD-reaction and Davis–Evans-hydroxylation.
A general and efficient route to enantioselective synthesis of pumiliotoxin A alkaloids via a common key intermediate
作者:Bing Wang、Kai Fang、Guo-Qiang Lin
DOI:10.1016/j.tetlet.2003.08.113
日期:2003.10
A general and efficient formal synthesis of pumiliotoxins and allopumiliotoxins has been achieved via a common key intermediate 3a. Our route featured a novel one-pot substitution–ring-opening sequence and an efficient Claisen-type condensation. This method is also applicable to quinolizidine derivative 2b.
Enantioselective Synthesis of α-Chiral Amides by Catalytic Hydrogenation with Iridium N,P-Complexes
作者:Bram B. C. Peters、Norman Birke、Pher G. Andersson、Luca Massaro
DOI:10.1055/s-0042-1751399
日期:——
The catalytic asymmetric hydrogenation of olefins constitutes a powerful method for the preparation of chiral compounds. A series of prochiral unsaturated amides were efficiently reduced with high enantioselectivities by means of an iridium N,P-complex-catalyzed hydrogenation. Its application in the synthesis of fenpropidin and the possibility of using isomeric mixtures of starting materials are attractive