Synthesis of mosesin-4, a naturally occurring steroid saponin with shark repellent activity, and its analog 7-β-galactosyl ethyl cholate
作者:Dario Gargiulo、Timothy A. Blizzard、Koji Nakanishi
DOI:10.1016/s0040-4020(01)89488-6
日期:——
The first synthesis of mosesin-4 (13), a naturally occurring steroid saponin with shark repellent activity, and its analog 19, isdescribed. They both possess a free galactose residue attached axially at the 7α position of the steroidal aglycon. Methyl cholate 3-cathylate (2) was used as a model for exploring various several methods to glycosidate the severely hindered 7α-position. Best results were