Multifunctional Palladium Catalysis. 2. Tandem Haloallylation Followed by Wacker−Tsuji Oxidation or Sonogashira Cross-Coupling
摘要:
graphicMultifunctional palladium catalysis is utilized in the one-pot stereocontrolled synthesis of tetrasubstituted methyl ketones and enynes. The homogeneous palladium dihalide catalyst utilized for the bromo-/chloroallylation of alkynes is reused in situ for subsequent Wacker-Tsuji oxidation or Sonogashira cross-coupling.
A two step procedure as improved alternative to the cyclocarbonylation of allyl halides and acetylene derivatives mediated by Ni(CO)4
作者:F. Camps、J. Coll、A. Llebaria、J.M. Moretó
DOI:10.1016/s0040-4039(00)82199-1
日期:1988.1
by Pd(II) complexes, such as bis-acetonitrile palladium(II) bromide, followed by cyclocarbonylation of the resulting adducts with Ni(CO)4 in CH3CN containing precise amounts of CH3OH and Et3N is a better procedure than the direct cyclocarbonylation of these substrates mediated by Ni(CO)4 for preparation of cyclopentenones, specially for monosubstituted acetylenes or weakly polarized disubstituted acetylenes