Synthesis and reactivity of novel π-allylcyclopentadienyl cobaltolactone complexes
作者:Steven D. R. Christie、Christophe Cosset、David R. Hamilton、William J. Kerr、John M. O'Callaghan
DOI:10.1039/c39950002051
日期:——
A range of novel cobaltolactone complexes are prepared under photolytic conditions from dicarbonylcyclopentadienylcobalt and vinyl epoxides; their subsequent reactivity under a selected series of reaction conditions is described.
Various gamma-heteroatom-substituted allylindium reagents were prepared, and their reactions with carbonyl compounds were examined. The reaction of 1,3-dibromopropene with metallic indium gave two types of organoindium species, gamma-bromoallylindium and allylic diindium reagents. While the former gave 2-phenyl-3-vinyloxirane upon the coupling with benzaldehyde, the latter gave 1-phenylbut-3-en-1-o1. 1-Iodo-3-bromopropene gave the homoallylic alcohol exclusively. gamma-Alkoxyallylindium reagents were prepared by treating the corresponding gamma-alkoxyallyllithium with indium trichloride and reacted with benzaldehyde to give vic-diol mono ethers in high yields with good syn selectivity. gamma-(Trimethylsilyl)allylindium and alpha,gamma-disubstituted allylindium reagents were also prepared via transmetalation with the corresponding allyllithium.