Interesting transformations of naturally occurring cassane diterpenoids and bioevaluation of the products
摘要:
Two cassane diterpenoids, pulcharrin G (1) and 6 beta-cinnamoyl-7 beta-hydroxy-voucapen-5-alpha-ol (2), the constituents of Caesalpinia pulcherrima, were treated with BF3 center dot OEt2 to furnish two olefinic products 3 and 4, respectively. The products were formed by elimination of water and migration of a methyl group from C-4 to C-5. The cytotoxic and antimicrobial activities of 3 and 4 were examined. (C) 2012 Elsevier Ltd. All rights reserved.