Asymmetric total synthesis of steroid hormones: an efficient route to (+)-3β-hydroxy-17-methoxy-D-homo-18-nor-5α-androsta-13,15,17-triene

Abstract
Optically active 3β-hydroxy-17-methoxy-D-homo-18-nor-5α-androsta-13,15,17-triene (2), an important intermediate in the synthesis of 5α-Δ16-pregnen-3β-ol-20-one (3), has been synthesised by thermolysis of optically active 4-hydroxy-2-[2-(4-methoxybenzocyclobutenyl)ethyl]-1-methyl-1-vinylcyclohexane (1).

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