Two-step enzymatic modification of solid-supported bergenin in aqueous and organic media
作者:Umar Akbar、Dong-Sik Shin、Elizabeth Schneider、Jonathan S. Dordick、Douglas S. Clark
DOI:10.1016/j.tetlet.2009.12.119
日期:2010.2
carslberg (SC) extracted into the organic solvent via ion-pairing. Enzymatic cleavage of 7-bromo-4-butyrylbergenin from carboxy-CPG (9.6% final yield) was accomplished using lipase B (LipB) in an aqueous/organic mixture (90/10 v/v of water/acetonitrile), demonstrating the feasibility of solid-phase biocatalysis of a natural product in aqueous and non-aqueous media.
One novel tetranortriterpenoid derivative, xylocarponoid A, representing the first example of C28 skeleton limonoid, was isolated from the seeds of the Chinesemangrove, Xylocarpusgranatum. Its C-1′-epimer, xylocarponoid B, was formed in CDCl3. Their structures were elucidated by extensive spectroscopic analysis. A plausible biosynthetic pathway of xylocarponoid A was proposed.