摘要:
A PROCESS FOR THE PREPARATION OF A 17A-ACYLOXY-20KETO-STEROID OF THE PREGNANE OR 19-NORPREGNANE SERIES, SAID PROCESS COMPRISING THE STEP OF CATALYTICALLY CONVERTING THE CORRESPONDING 20-ACYLOXY - 17A,20 - EPOXY-STEROID WITH A CATALYTICALLY EFFECTIVE AMOUNT OF A CONCENTRATED STRONG ACID SUCH AS PERCHLORIC ACID, H2SO4, BF3, HC1, P-TOLUENE SULFONIC ACID AND THE LIKE. THE FINAL PRODUCTS HAVE THE KNOWN ACTIVITIES ASSOCIATED WITH STEROIDS OF THE PREGNANE AND 19-NOR-PREGNANE SERIES, E.G., PROGESTATIONAL, ANTI-INFLAMMATORY, ETC.
摘要:
5-Bromo-6-fluoro steroids are produced by the bromine-fluorine addition to the double bond of a Delta 5-unsaturated steroid using an N-bromoacylamide or N-bromoimide and aqueous hydrogen fluoride. A novel steroid produced by the process is 6 Beta fluoro-5 Alpha -bromo-3 Beta ,17 Beta -dihydroxy-androstane.