Abstract
Abstract Hydrolysis of 3-methoxy-2,5(10)-diene steroids (1a-c) via oxalic acid in the presence of silica gel was developed as a fast selective synthetic method towards corresponding 5(10)-en-3-ones (2a-c) in good yield (51∼94%). This also provided a new method for selective ketalisation of 17-keto over 3-keto (2c).
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