Stereoselective total synthesis of styryl-lactones: (+)-crassalactones B and C, (+)-howiionol A, (+)-tricinnamate, (+)-goniofufurone and (+)-dicinnamoyl goniofufurone
摘要:
The total synthesis of (+)-crassalactone B (+)-crassalactone C (+)-howiionol A (+)-tricinnamate (+)-goniofufurone and (+)-dicinnamoyl goniofufurone is achieved by a chit-on approach starting from diacetone D-glucose (DAG) Mitsunobu inversion Wittig olefination and ring closing metatheses were used as key steps for (+)-howiionol A and (+)-tricinnamate Meldrum s acid was used for the synthesis of (+)-crassalactone C (+)-goniofufurone and (+)-dicinnamoyl goniofufurone Yamaguchi esterification was used for (+)-crassalactone B while a Grignard reaction followed by concomitant deallylation was first reported in the synthesis of (+)-dicinnamoyl goniofufurone (C) 2010 Elsevier Ltd All rights reserved
Stereoselective total synthesis of styryl-lactones: (+)-crassalactones B and C, (+)-howiionol A, (+)-tricinnamate, (+)-goniofufurone and (+)-dicinnamoyl goniofufurone
作者:Gangavaram V.M. Sharma、Samala Mallesham
DOI:10.1016/j.tetasy.2010.10.016
日期:2010.11
The total synthesis of (+)-crassalactone B (+)-crassalactone C (+)-howiionol A (+)-tricinnamate (+)-goniofufurone and (+)-dicinnamoyl goniofufurone is achieved by a chit-on approach starting from diacetone D-glucose (DAG) Mitsunobu inversion Wittig olefination and ring closing metatheses were used as key steps for (+)-howiionol A and (+)-tricinnamate Meldrum s acid was used for the synthesis of (+)-crassalactone C (+)-goniofufurone and (+)-dicinnamoyl goniofufurone Yamaguchi esterification was used for (+)-crassalactone B while a Grignard reaction followed by concomitant deallylation was first reported in the synthesis of (+)-dicinnamoyl goniofufurone (C) 2010 Elsevier Ltd All rights reserved
Cytotoxic Styryl-Lactones from the Leaves and Twigs of <i>Polyalthia crassa</i>
(+)-howiinol A. Their structures were determined on the basis of spectroscopic methods. The absolute configuration of 1-3 was established by chemical conversions. Single-crystal X-ray analysis and the Mosher ester method were used to confirm the absolute stereochemistry of 4. Cytotoxic evaluation against several mammalian cancer cell lines was performed on all new isolates, aristolactam AII, and the modified