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
由β-(苯硫基)丙酰氯或甲基乙烯基酮容易制得的β-磺酰基乙烯基酮(5),(7),(9)和(10)与由共轭加成的烯醇化物有效地反应。 (E)-丁-2-烯基二苯基氧化膦的碳负离子成2-甲基环戊-2-烯酮,以高度立体选择性的方式提供乙烯基β-二酮,其中两个在氢化和醛醇缩合后已高产率地转化为氢化茚酮。