Bridged steroids with a bicyclo[2.2.1]heptane ring A system
Abstract
Thermal rearrangement of 3-oxo-5-vinyl steroids at 350 °C gives bridged steroids with a bicyclo[2.2.1]heptane ring A system; a second, minor product from 5-vinyl-5β-oestrane-3,17-dione (6) has been identified as 5-trans-propenyl-A-nor-5β-oestrane-3,17-dione (9).