Novel steroid derivatives of pregna-4,9 (11), 17 (20) -trien-3-one, preparation method thereof, pregna-4,9 (11), 16-triene-3,20-dione Uses thereof and novel intermediates in the preparation of type steroid compounds

摘要

The present invention relates to a novel steroid derivative of pregna-4,9 (11), 17 (20) -trien-3-one, a process for its preparation, pregna-4,9 (11), 16-triene-3, It relates to their use and novel intermediates in the preparation of 20-dione type steroid compounds.