Cyclization of polyenes. 46. Synthesis of (.+-.)-asperdiol, an anticancer cembrenoid
作者:Tadahiro Kato、Mario Aoki、Tadao Uyehara
DOI:10.1021/jo00385a028
日期:1987.5
Cyclization of polyenes. 49. Cyclization of epoxyneocembrene derivatives to secotrinervitanes
作者:Toshifumi Hirukawa、Akira Koarai、Tadahiro Kato
DOI:10.1021/jo00014a036
日期:1991.7
Four stereoisomers of epoxyneocembrene derivatives 5-8 were treated with BF3.OEt2 as potential model reactions for the proposed biogenesis of secotrinervitane-type diterpenoids (Scheme I). Two of them (5 and 6) afforded secotrinervitane derivatives, while the remaining isomers 7 and 8 gave no cyclization products (Table I). The natural product, secotrinervitene-2-beta,3-alpha-diol (2a) was synthesized from 5 in dl-form.