Acs P, Takács A, Szilágyi A, Wölfling J, Schneider G, Kollár L. The synthesis of 17-alkoxycarbonyl- and 17-carboxamido-13alpha-estra-1,3,5(10),16-tetraene derivatives via palladium-catalyzed carbonylation reactions.
Steroids 2008;
73:669-75. [PMID:
18367222 DOI:
10.1016/j.steroids.2008.02.002]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2008] [Revised: 02/02/2008] [Accepted: 02/10/2008] [Indexed: 11/27/2022]
Abstract
17-Alkoxycarbonyl- and 17-carboxamido-13alpha-estra-1,3,5(10),16-tetraenes were synthesized from the 17-iodo-13alpha-estra-1,3,5(10),16-tetraene derivative in palladium-catalyzed alkoxycarbonylation and aminocarbonylation reactions, respectively. The synthesis of the 17-iodo-16-ene derivative, used as substrate, is based on the transformation of the 17-keto derivative (epiestrone methyl ether) to hydrazone, which was treated with iodine in the presence of a base (1,1,3,3-tetramethyl guanidine). 17-Carboxamides were obtained in good yields (up to 88%) not only with simple alkyl/aryl amines but also with amino acid methyl esters as N-nucleophiles. The use of alcohols as O-nucleophiles in alkoxycarbonylation resulted in the corresponding 17-esters; however, yields of synthetic interest were obtained only with methanol.
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