Ein neuer Reaktionsweg zu 1, 3-Dicarbonylderivaten. Modelluntersuchungen am A/B-Teil von 3-Oxo-5α-steroiden

A New Route to 1, 3-Dicarbonyl Derivatives, Model Investigations on the A/B-Part of-3-Oxo-5α-steroids Starting from 1 the 1, 3-dicarbonyl compounds 4a – d were synthetized via the enynes 2a – e and the relatively unstable epoxides 3a – d . The latter were reacted with 95% formic acid to gave 4a – d ; small amounts of the furane derivatives 5a – c were identified as by-products in this last step. In the presence of catalytic amounts of HgSO₄ the epoxides 3a – c yielded with 95% formic acid the furanes 5a – c , but no detectable amounts of 4a – c .