Enantioselective synthesis of the medium ring ethers, tetrahydrooxepin, oxocane and hexahydrooxonin, of ciguatoxin. Extensive ring-expansion and chemoenzymatic desymmetrization strategy
作者:Tohru Oishi、Megumi Maruyama、Mitsuru Shoji、Kenji Maeda、Naomi Kumahara、Shin-ichiro Tanaka、Masahiro Hirama
DOI:10.1016/s0040-4020(99)00370-1
日期:1999.6
The extensive ring-expansion strategy for the synthesis of tetrahydrooxepin, oxocane, and hexahydrooxonin, which correspond to the D(E), I and F rings of ciguatoxin (CTX1B, 1), respectively, has been established. Chemoenzymatic acylation of the meso alcohols using a lipase provides an expeditious entry for the enantiomeric building blocks. (C) 1999 Elsevier Science Ltd. All rights reserved.