New strategy for the synthesis of the taxane diterpenes: Formation of the BC-rings of taxol via a [5+2]-pyrylium ylide-alkene cyclization, ring expansion strategy
The BC-rings of taxol can be synthesized using an intramolecular [5+2]-pyrylium ylide-alkene cyclization, followed by gem-methylcyclopropanation and reductive cleavage of the internal cyclopropane bond.
[EN] METHODS, COMPOSITIONS, AND COMPOUNDS FOR THE REDUCTION OF ILLEGAL METHAMPHETAMINE PRODUCTION<br/>[FR] PROCÉDÉS, COMPOSITIONS, ET COMPOSÉS POUR RÉDUIRE LA PRODUCTION ILLÉGALE DE MÉTHAMPHÉTAMINES
申请人:JOHNSON BRENT A
公开号:WO2013036567A2
公开(公告)日:2013-03-14
Disclosed herein are compounds and methods for using prodrugs of pseudoephedrine and ephedrine to inhibit illegal methamphetamine synthesis.
Taxane diterpenes 1. Control of relative and absolute stereochemistry in intramolecular pyrylium ylide-alkene cyclizations for the synthesis of taxol precursors
作者:William E. Bauta、John Booth、Mary E. Bos、Mark DeLuca、Louis Diorazio、Timothy J. Donohoe、Christopher Frost、Nicholas Magnus、Philip Magnus、José Mendoza、Philip Pye、James G. Tarrant、Stephen Thom、Feroze Ujjainwalla
DOI:10.1016/0040-4020(96)00867-8
日期:1996.11
Intramolecular pyrylium ylide-alkene cyclizations provide control of the absolute stereochemistry at the crucial C-19 angular methyl group, and leads to bicyclo[5.4.03,8]undecenones that contain the structural elements of the B/C rings of the taxanes.