A new route to precursors of ecdysteroids using a regio- and stereoselective hydroboration
作者:F Dolle
DOI:10.1016/s0040-4020(01)96160-5
日期:1991.8.19
We have developed a newroute to precursors of ecdysteroids, using a regio- and stereoselective hydroboration. Hydroboration of 3,3-(ethylenedioxy)-cholesta-5,7-diene (from 7-dehydrocholesterol in two steps), followed by oxidation with alkaline hydrogen peroxide, produces 3,3-(ethylenedioxy)-5β-cholest-7-en-6β-ol (the same reaction with 7-dehydrocholesterol leads only to the 5α-alcohol (OH-6α), prohibiting