Taxadiene Synthase-Catalyzed Cyclization of 6-Fluorogeranylgeranyl Diphosphate to 7-Fluoroverticillenes
作者:Yinghua Jin、David C. Williams、Rodney Croteau、Robert M. Coates
DOI:10.1021/ja050592r
日期:2005.6.1
The mechanism of the taxadiene synthase-catalyzed cyclization of (E,E,E)-geranylgeranyl diphosphate (GGPP, 7) to taxadiene (5) is proposed to proceed through a verticillen-12-yl carbocation intermediate (8) that undergoes an 11 --> 7 proton transfer leading to formation of the C ring. The substrate analogue 6-fluoroGGPP (17) was synthesized to elucidate the stereochemistry of the putative verticillenyl
Total synthesis of verticillene. A biomimetic approach to the taxane family of alkaloids
作者:Michael J. Begley、Christopher B. Jackson、Gerald Pattenden
DOI:10.1016/s0040-4020(01)85602-7
日期:1990.1
coupling of the -aldehyde (10) in the presence of Ti(O), followed by 1,4-reducdon of the resulting tetraene (9) using sodium in ammonia, provides a facile synthesis of ,-verticillene (8), the putative biogenetic precursor of the taxane family of alkaloids e.g. (1) and (2). Treatment of either verticillene (8), verticillene 7,8-epoxide (21), verticillol 7,8-epoxide (27) or anhydroverticillol 7,8-epoxide