【摘 要】
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This paper deals with the synthesis of two new (±)-3-oxa-A-nor steroids 1a and 1 b.The conjugated addition of 5’-methylfurandithane anion 8b to the CD-ring s
【出 处】
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Acta Chimica Sinica(English Edition)
论文部分内容阅读
This paper deals with the synthesis of two new (±)-3-oxa-A-nor steroids 1a and 1 b.The conjugated addition of 5’-methylfurandithane anion 8b to the CD-ring synthon 9 in HMPA-THFafforded 9, 10-seco-3-oxa-A-nor steroid 22. The intramolecular cyclization of 22 in acidic mediumgave 23, which underwent hydrolytic desulfurization at elevated temperature in acidic medium togive 1b. The desulfurization of 23 over Raney nickel gave 1a.
This paper deals with the synthesis of two new (±) -3-oxa-A-nor steroids 1a and 1b. The conjugated addition of 5’-methylfurandithane anion 8b to the CD-ring synthon 9 in HMPA-THFaf forded 9, 10 -seco-3-oxa-A-nor steroid 22. The intramolecular cyclization of 22 in acidic mediumgave 23, which underwent hydrolytic desulfurization at elevated temperature in acidic medium togive 1b. The desulfurization of 23 over Raney nickel gave 1a.
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