General approach to halogenated tetrahydrofuran natural products from red algae of the genus Laurencia. Total synthesis of (.+-.)-trans-kumausyne and demonstration of an asymmetric synthesis strategy
作者:Mark J. Brown、Timothy Harrison、Larry E. Overman
DOI:10.1021/ja00014a032
日期:1991.7
A general strategy for the synthesis of C 15 halogenated tetrahydrofuranoid lipids from red algae of the genus Laurencia has been developed. The central step is the convenient formation of hydrobenzofuranone (±)-5 on a large scale, and with complete stereocontrol, from the acid-catalyzed condensation of 1-vinylcyclopentanediol (3) and α-(benzyloxy) acetaldehyde (Scheme II). Starting with the chiral