United States Patent Office Patented Jan
3,365,473 United States Patent Office Patented Jan. 23, 1968 1. 3,365,473 133-LOWER ALKYL GONA-4,8(14)-DIEN-3-ONES 178 PROCESS FOR THE PRODUCTION THEREOF David Taub, Metuchen, N.J., assignor to Merck & Co., Inc., Rahway, N.J., a corporation of New Jersey No Drawing. Filed Dec. 28, 1965, Ser. No. 517,128 15 Claims. (CI. 260-397.3) ABSTRACT OF THE DISCLOSURE 10. This invention disclosed herein is concerned with a novel synthesis of novel intermediate compounds useful in the synthesis of known steroids of the estrane series which have utility in the pharmaceutical field as gonadotro phin inhibiting agents and which also have progestational 15 activity. More particularly, this invention relates to a synthesis of 13.6-lower alkylgona-4,8(14)-dien-3-one-17B ol or 17-keto steroids (Compound III), 3-hydroxy-136 lower alkylgona-1,3,5 (10),8(14)-tetraen-17 (3-ol, or 17B keto, 17-acetal or ketal steroids (Compound IV). In this 20 synthesis, 3-alkoxy-17B-lower alkyl-gona-1,3,5 (10),8,14 pentaen-17B-ol is reacted with lithium and liquid am monia thereby forming 3 alkoxy-133-lower alkyl gona 2,5 (10),8(14)-triene-176-ol which, upon acidic hydrolysis, is converted to the corresponding 3-keto A-derivative; the latter compound is reacted with N-bromo-succinimide thereby aromatizing ring A to form 8 (14)-dehydro estradiol or other 13-alkyl analog; catalytic hydrogena tion of the last-named compound produces 8-iso estradiol 30 The starting material, Compound II, may be prepared or other 13-alkyl analog which is reacted with an etherify by the reduction of a 3-hydroxy or substituted oxy-1718 ing agent to from the corresponding 3-alkyl ether; sodium lower alkyl-1,3,5 (10),8,14-pentaen-17f8-ol, 17-keto, or 17 dichromate oxidation of the latter forms 8-isoestrone 3 acetal or ketal (Compound I) with an alkali metal, pref alkyl ether which is reacted with chloranil to form the erably lithium, in liquid ammonia.
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