The first example of dirhodium(II) complex-catalyzed asymmetric intermolecular C-H insertion with alpha-alkyl-alpha-diazoesters is described. The reaction of 1,4-cyclohexadiene with 2,4-dimethyl-3-pentyl alpha-alkyl-alpha-diazoacetates under catalysis by dirhodium(II) tetrakis[N-phthaloyl-(S)-tert-leucinate], Rh-2(S-PTTL)(4), or dirhodium(II) tetrakis[N-tetrafluorophthaloyl-(S)-tert-leucinate], Rh-2(S-TFPTTL)(4), gave the corresponding C-H insertion products with enantioselectivities of up to 86% ee, albeit in low to modest yields.
MANDAL A. K.; KASAR T. G.; MAHAJAN S. W.; JAWALKAR D. G., SYNTH. COMMUN., 17,(1987) N 5, 563-574
作者:MANDAL A. K.、 KASAR T. G.、 MAHAJAN S. W.、 JAWALKAR D. G.
DOI:——
日期:——
Mesoporous Silica Nanosphere Supported Ruthenium Catalysts for Asymmetric Hydrogenation