Abstract
Stereochemical structural transformations of cardiosteroids to create in them additional lactone rings were studied. Creation of δ-lactones by reaction of a 3β-OH group and a 19-carboxylic group to give the corresponding A/B-trans cardiosteroids and creation of β-lactones by reaction of a 5β-OH group and a 19-COOH to give the corresponding A/B-cis steroids were studied. The new biologically active compounds 8(14)-dehydrobovogenin-19-carboxylic acid 3β-O-19-lactone, strophanthidine-19-carboxylic acid 5β-O-19-lactone, cymarin-19-carboxylic acid 5β-O-19-lactone, convallatoxin-19-carboxylic acid 5β-O-19-lactone, and strophalloside-19-carboxylic acid 5β-O-19-lactone were prepared.
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