Use of .beta.-sulfonyl vinyl ketones as equivalents to vinyl ketones in the Robinson annelation. Convergent, highly stereoselective preparation of a hydrindanol related to vitamin D from 2-methylcyclopent-2-enone and lithiated (E)-but-2-enyldiphenylphosphine oxide
Use of .beta.-sulfonyl vinyl ketones as equivalents to vinyl ketones in the Robinson annelation. Convergent, highly stereoselective preparation of a hydrindanol related to vitamin D from 2-methylcyclopent-2-enone and lithiated (E)-but-2-enyldiphenylphosphine oxide
Preparation of hydrindenones from 2-methylcyclopent-2-enone and the carbanion of (E)-but-2-enyldiphenylphosphine oxide: efficient enolate trapping with β-sulphonylvinyl ketones
作者:Richard K. Haynes、Simone C. Vonwiller
DOI:10.1039/c39870000092
日期:——
The β-sulphonylvinyl ketones (5), (7), (9), and (10), easily prepared from β-(phenylthio)propionyl chloride or from methyl vinyl ketone, react efficiently with the enolate produced by the conjugate addition of the carbanion of (E)-but-2-enyldiphenylphosphine oxide to 2-methylcyclopent-2-enone to provide in highly stereoselective fashion vinylogous β-diketones, two of which upon hydrogenation and aldol