A Novel Stereocontrolled Synthesis of 1,2-<i>trans</i> Cyclopropyl Ketones via Suzuki-Type Coupling of Acid Chlorides with Cyclopropylboronic Acids
作者:Han Chen、Min-Zhi Deng
DOI:10.1021/ol000013h
日期:2000.6.1
see text] The palladium-catalyzed cross-coupling reaction of cyclopropylboronic acids with acyl chlorides was achieved by the combination of Ag(2)O and K(2)CO(3) as the base. Highly enantiomerically enriched cyclopropyl ketones (ee >90%) were also obtained by the reaction of corresponding chiral cyclopropylboronic acids.
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
Intramolecular acylations of γ-benzoyloxy phosphine oxides: synthesis of optically active cyclopropyl ketones
作者:Adam Nelson、Stuart Warren
DOI:10.1016/0040-4039(96)00049-4
日期:1996.2
Intramolecular acylation of γ-benzoyloxy phosphineoxides with LDA in the presence of Me3SiCl give silyl ethers with high steroselectivity: treatment of these silyl ethers with t-BuOK gives opticallyactive di- and trisubstituted cyclopropyl ketones in good yield.