This paper describes the use of zamoranic acid in the first semisynthesis of the furolabdane (+)-angeloyl-gutierrezianolic acid methyl ester diterpenoid, which also establishes the absolute configuration of the natural product. Direct deconjugation of Delta(7) in zamoranic acid and Bestmann methodology for the furan ring synthesis are the key steps. (C) 2010 Published by Elsevier Ltd.
ZDERO, C.;BOHLMANN, F.;NIEMEYER, H. M., PHYTOCHEMISTRY, 29,(1990) N, C. 567-571
作者:ZDERO, C.、BOHLMANN, F.、NIEMEYER, H. M.
DOI:——
日期:——
Diterpenoids from <i>Baccharis pingraea</i>
作者:Gerald A. Wächter、Gloria Montenegro、Barbara N. Timmermann
DOI:10.1021/np980215a
日期:1999.2.1
From the aerial parts of Baccharis pingraea the known furolabdane, angeloyl-gutierrezianolic acid (1); two novel diterpenoids, furolabda-6,8-dien-17-oic acid (2) and furolabd-7-en-17-oic acid (3); and the known linear diterpenoid, (10E)-centipedic acid (4), were isolated. LC/MS suggested the presence of gutierrezianolic acid (5). The structures of the new compounds were elucidated by 1D and 2D NMR