Palladium-catalyzed ring expansion reaction of 1-alkynylcyclobutanols with aryl iodides: an efficient route to 2-disubstituted methylenecyclopentanones
作者:Li-Mei Wei、Li-Lan Wei、Wen-Bin Pan、Ming-Jung Wu
DOI:10.1016/s0040-4039(02)02581-9
日期:2003.1
The reaction of 1-alkynylcyclobutanols with aryl iodides in the presence of Pd(OAc)2 and Et3N in acetonitrile at 80°C for 24 h gives 2-disubstituted methylenecyclopentan-1-ones in modest to good yields. The tandem insertion-ring expansion process proceeds via the formation of an alkynyl π-complex, followed by migration of a carbon-carbon bond of the tert-alkanol to form the cyclopentanones stereoselectively
Eleven new diaryl-methylenecyclopentanone Mannich hydrochlorides and relatedcompounds were synthesized with different modification on Mannich base and alpha,beta-unsaturated bonds. The glutathione-binding ability, glutathione-s-transferase pi (GSTpi) inhibition and antitumor effect of these compounds were compared. Compounds containing both Mannich base and alpha-unsaturated bond have GSH binding