期刊
ORGANIC PROCESS RESEARCH & DEVELOPMENT
卷 20, 期 2, 页码 306-311出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.oprd.5b00394
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An efficient synthesis of 17-alpha-estradiol 1 is described. Utilization of in situ IR allowed for an online monitoring of the key Mitsunobu reaction and development of a safe and reliable synthesis of 17-alpha-estradiol 1 in 78% overall yield over three steps. Benzoylation of 17-beta-estradiol 2 is conducted at high regioselectivity under phase-transfer catalysis (PTC) conditions, followed by a Mitsunobu reaction to invert the chiral center at C-17 and provide intermediate 5, containing the core structure of 17-alpha-estradiol 1. Finally, the desired active pharmaceutical ingredient (API) is prepared by saponification of the remaining esters.
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