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Beilstein J. Org. Chem. 2017, 13, 1303–1309, doi:10.3762/bjoc.13.126
Graphical Abstract
Scheme 1: Syntheses of 2- or 4-phenethynyl-13α-estrones (8–11) by Sonogashira coupling.
Scheme 2: Partial or full hydrogenation of compounds 8c–11c.