Synthesis of (−)-albrassitriol and (−)-6-<i>epi</i>-albrassitriol from (+)-larixol
作者:Pavel F. Vlad、Alexandru Ciocarlan、Mihai Coltsa、Carolina Edu、Andrei Biriiac、Alic Barba、Calin Deleanu、Alina Nicolescu、Michele D’Ambrosio、Aede de Groot
DOI:10.1080/14786419.2012.706297
日期:2013.5
A novel synthesis of natural drimanic compounds, ()-albrassitriol (2) and ()-6-epi-albrassitriol (3), has been carried out starting from an easily available labdane diterpenoid, (+)-larixol (1). In a two-step procedure, (+)-larixol (1) was converted into 14,15-bisnorlab-7-ene-6,13-dione (9), which was then submitted to a Norrish type II photochemical degradation yielding drim-7,9(11)-diene-6-one (10), whose treatment with OsO4 led selectively to the formation of drim-7-ene-9,11-diol-6-one (12). The same compound was obtained by selective epoxidation of the C(9)C(11) double bond in drim-7,9(11)-diene-6-one (10) with monoperphtalic acid. Treatment of the resulting mixture of - and -epoxides (13 and 14) with HClO4 yielded drim-7-ene-9,11-diol-6-one (12). Reduction of the C6-carbonyl group in drim-7-ene-9,11-diol-6-one (12) with LiAlH4 afforded ()-albrassitriol (2) and ()-6-epi-albrassitriol (3), 12.4% and 13.6% overall yields, respectively.