Abstract
The synthesis of 7 new brassinosteroid analogs having epoxy function in A ring and side chain together with ketone or lactone in B ring is reported. The epoxidation and regioselective lactonization of the diene 3 have been achieved in only one step using molecular oxygen and aldehyde. The influence of either an epoxide or a double bond at C2,C3 on the regioselectivity of the Baeyer-Villiger reaction is discussed.
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