Total synthesis of (+)-cyclomyltaylan-5α-ol isolated from the taiwanese liverwort Reboulia hemisphaerica
作者:Hitoshi Sakai、Hisahiro Hagiwara、Yoshiaki Ito、Takashi Hoshi、Toshio Suzuki、Masayoshi Ando
DOI:10.1016/s0040-4039(99)00338-x
日期:1999.4
The novel tetracyclic sesquiterpenoid (+)-cyclomyltaylan-5α-ol 1 has been synthesized starting from (S)-(+)-Hajos-Wiechert ketone analogue 3via SmI2-promoted reductive cyclization as a key step. Thus, the absolute configuration has been established to be 2R,3R, 4R,5S,6R,7R (cyclomyltaylane numbering) as depicted in structure 1.
新颖的四环倍半萜(+) - cyclomyltaylan-5α醇1已经合成从(起始小号) - (+) -豪约什-维谢尔酮类似物3经由SMI 2促进的还原性环化作为关键步骤。因此,如结构1中所示,绝对构型已经确定为2 R,3 R,4 R,5 S,6 R,7 R(环戊烷编号)。