| abstract |
A process for preparing a 3,20-diketo-pregnene having a hydroxyl group at the 11β position or a keto group at the 11 position and having a 1,4-dioxane or 1 ring condensed at the 16 and 17 positions, 4-dioxin, in which a steroid of the formula **(See formula)** and derivatives thereof dehydrogenated at the 1,2-position and at the 6,7-position, where Z is hydrogen, hydroxyl, acyloxy or halogen; Y is hydrogen and Y'is hydroxyl, or Y and Y' together are = 0; X is hydrogen or halogen; P is hydrogen, methyl, or chlorine; Q is hydrogen, methyl, or fluoro; y and are the same or different and are hydrogen, alcohol or aryl, is treated with an acid catalyst to form a product of the formula (see formula) (Machine-translation by Google Translate, not legally binding) |