Claims
- 1. A compound having a formula selected from the group consisting of ##STR33## wherein R.sub.1 is hydrogen or methyl, R.sub.2 is methyl or ethyl, the A, B, C and D rings optionally containing at least one double bond and optionally substituted with at least one member of the group consisting of optionally protected --OH, .dbd.0, alkyl and alkoxy of 1 to 4 carbon atoms, halogen and alkenyl and alkynyl of 2 to 4 carbon atoms, R is selected from the group consisting of halogen, --OH, alkylthio and alkoxy of 1 to 6 carbon atoms, aralkoxy of 7 to 15 carbon atoms and ##STR34## R.sub.3 and R.sub.4 are individually hydrogen, or alkyl of 1 to 6 carbon atoms or aralkyl of 7 to 15 carbon atoms or taken together with the nitrogen form a heterocycle optionally containing another nitrogen or oxygen atom, said compounds containing in the 11-position, optionally protected keto and in the 12-position, an optionally protected hydroxy or optionally protected keto.
Priority Claims (1)
Number |
Date |
Country |
Kind |
86 17051 |
Dec 1986 |
FRX |
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PRIOR APPLICATION
This application is a division of U.S. patent application Ser. No. 128,997, filed Dec. 4, 1987, now U.S. Pat. No. 4,927,921.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0900385 |
Dec 1984 |
BEX |
Non-Patent Literature Citations (3)
Entry |
CA 107:134545 (1986) Otsuka et al. |
CA 105:209265 (1986) Terasawa et al. |
CA 102:149614 (1984) Taguchi et al. |
Divisions (1)
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Number |
Date |
Country |
Parent |
128997 |
Dec 1987 |
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