作者:Masayoshi Tsubuki、Hironao Takada、Tadashi Katoh、Shigehiro Miki、Toshio Honda
DOI:10.1016/0040-4020(96)00897-6
日期:1996.11
The first synthesis of a new zooecdysteroid gerardiasterone was achieved in a diastereoselective manner employing asymmetric dihydroxylation of the E-olefin 34 in the presence of DHQ-CLB as a chiral ligand. This synthesis unambiguously confirmed the structure of gerardiasterone as (20R,22R,23S)-2β,3β,14α,20,22,23,25-heptahydroxy-5β-cholest-7-en-6-one (2a).
在DHQ-CLB作为手性配体的情况下,采用E-烯烃34的不对称二羟基化,以非对映选择性的方式实现了新的动物蜕皮类甾醇gerardiasterone的首次合成。该合成确认明确的gerardiasterone结构为(20 - [R,22 - [R,23小号)-2 β,3 β,14 α,20,22,23,25-heptahydroxy-5 β -cholest -7-烯-6-一(2a)。