| abstract |
DEFINED $4,20,22-BUFATRIENOLIDE RHAMNOSIDE ACYLATES OF THE FORMULA 17-(2-(O=)PYRAN-5-YL),14-HO,3-((3-(R3-O-),4-(R2-O-),5- (R1-O-),6-CH3-TETRAHYDROPYRAN-2-YL)-O-),13-R-ESTR-4-ENE WHEREIN R IS METHYL OR FORMYL R1-R3 ARE HYDROGEN OR ACYL, AND AT LEAST ONE OF R1-R3 IS ACYL, AND METHOD OF MAKING THE SAME BY ACYLATION OF THE CORRESPONDING HYDROXY COMPOUNDS AND SEPARATION OF ANY MIXED REACTION PRODUCTS BY COLUMN CHROMATOGRAPHY AND/OR COUNTERCURRENT DISTRIBUTION. |