Synthetic Cardenolides and Related Products. II. Lactams

Abstract
On treatment of cardenolides with ammonia or methylamine two isomers are obtained, 21-amino-14β,21-oxidonorcholan-23-oic acid lactam and 21-amino-14β-hydroxy-16β,21-oxidonorcholan-23-oic acid lactam. The assignment of stereochemistry to each isomer is based on the n.m.r. spectra and the correlation with the structure of isodigitoxigenin or isogitoxigenin.

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