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Steroids

A convenient preparation of the side-chain lactone ring of a withanolide precursor.


PMID 2588305

Abstract

Condensation of C22 and C21 steroidal aldehydes with ethyl 4,6-dimethyl-2-oxo-2H-pyran-5-carboxylate 1 in alkaline medium, followed by decarboxylation, provides a simple route to the alpha, beta-unsaturated side-chain delta-lactone synthesis for a classical withanolide precursor.

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E33408
Ethyl isodehydracetate, 99%
C10H12O4