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A convenient preparation of the side-chain lactone ring of a withanolide precursor
A M Maione1, A Romeo, C G Casinovi
1Dipartimento di Studi Farmaceutici, Università La Sapienza, Roma, Italy.
Steroids
|September 1, 1989
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.