Tandem carbonyl ene cyclization-cycloalkylation: a route to trifluoromethyl diterpenoids.
摘要:
A new sequential carbonyl-ene cyclizatian/cycloalkylation of trifluoromethyl ketones catalyzed by aluminum Lewis acids is described. From ketone 1, the 4-CF3-4-OH cis-octahydrophenanthrene 6 is obtained in 50 % yield. From ketone 2, with MeAlCl(2) a total stereoselective route to the 4-CF3-trans-10-methyl podocarpatrienol 8 (90 % yield) has been found. These studies also exhibited some striking results in the stereochemical outcome of ene cyclizations.
Tandem carbonyl ene cyclization-cycloalkylation: a route to trifluoromethyl diterpenoids.
摘要:
A new sequential carbonyl-ene cyclizatian/cycloalkylation of trifluoromethyl ketones catalyzed by aluminum Lewis acids is described. From ketone 1, the 4-CF3-4-OH cis-octahydrophenanthrene 6 is obtained in 50 % yield. From ketone 2, with MeAlCl(2) a total stereoselective route to the 4-CF3-trans-10-methyl podocarpatrienol 8 (90 % yield) has been found. These studies also exhibited some striking results in the stereochemical outcome of ene cyclizations.
Tandem carbonyl ene cyclization-cycloalkylation: a route to trifluoromethyl diterpenoids.
作者:Ahmed Abouabdellah、Danièle Bonnet-Delpon
DOI:10.1016/s0040-4020(01)89305-4
日期:1994.1
A new sequential carbonyl-ene cyclizatian/cycloalkylation of trifluoromethyl ketones catalyzed by aluminum Lewis acids is described. From ketone 1, the 4-CF3-4-OH cis-octahydrophenanthrene 6 is obtained in 50 % yield. From ketone 2, with MeAlCl(2) a total stereoselective route to the 4-CF3-trans-10-methyl podocarpatrienol 8 (90 % yield) has been found. These studies also exhibited some striking results in the stereochemical outcome of ene cyclizations.