Improved Julia−Kocienski Conditions for the Methylenation of Aldehydes and Ketones
摘要:
The scope of the methylenation of aldehydes and ketones under optimized Julia-Kocienski conditions is broadened by using 1-tert-butyl-1H-tetrazol-5-ylmethyl sulfone. Two different Barbier-type procedures are applied with NaHMDS at -78 degrees C or Cs2CO3 at 70 degrees C. The latter conditions are also adapted for the preparation of 1,2-disubstituted olefins and intramolecular olefination reactions.
Improved Julia−Kocienski Conditions for the Methylenation of Aldehydes and Ketones
摘要:
The scope of the methylenation of aldehydes and ketones under optimized Julia-Kocienski conditions is broadened by using 1-tert-butyl-1H-tetrazol-5-ylmethyl sulfone. Two different Barbier-type procedures are applied with NaHMDS at -78 degrees C or Cs2CO3 at 70 degrees C. The latter conditions are also adapted for the preparation of 1,2-disubstituted olefins and intramolecular olefination reactions.
Improved Julia−Kocienski Conditions for the Methylenation of Aldehydes and Ketones
作者:Christophe Aïssa
DOI:10.1021/jo051693a
日期:2006.1.1
The scope of the methylenation of aldehydes and ketones under optimized Julia-Kocienski conditions is broadened by using 1-tert-butyl-1H-tetrazol-5-ylmethyl sulfone. Two different Barbier-type procedures are applied with NaHMDS at -78 degrees C or Cs2CO3 at 70 degrees C. The latter conditions are also adapted for the preparation of 1,2-disubstituted olefins and intramolecular olefination reactions.