Stereocontrol with phosphine oxides: synthesis of optically active cyclopropyl ketones
作者:Adam Nelson、Stuart Warren
DOI:10.1039/a907321c
日期:——
Treatment of β-keto γ′-hydroxy phosphine oxides, or silylated hemiacetal derivatives of these compounds, with potassium tert-butoxide in tert-butyl alcohol leads to the formation of cyclopropyl ketones. The synthesis of optically active 1,2-di- and 1,2,3-trisubstituted cyclopropyl ketones is described. The reaction is kinetically controlled and the ring-closure is generally stereospecific. A model