Palladium(0)-catalyzed cyclization-carbonylation of 2,7-octadienyl acetate and homologues
摘要:
The palladium(0)-catalyzed carbonylations, in acetic acid as a necessary solvent, of 2,7-octadienyl acetate and homologues via pi-allylpalladium species were preceded by their intramolecular oelfin insertion to form mixtures of cis/trans-2-vinylcyclopentylacetyl- and cis/trans-cyclohexylacetylpalladium intermediates, which undergo further the intramolecular (5-exo) Heck reaction to give bicyclo-[3.3.0] and [4.3.0] skeletons, respectively, except for one case affording trans-2-vinylcyclopentylacetic acid as a major product.
Formation of α,β-unsaturated carbonyl compounds by palladium-catalyzed oxidation of allylic alcohols
作者:Enrique Gómez-Bengoa、Pedro Noheda、Antonio M. Echavarren
DOI:10.1016/0040-4039(94)88235-5
日期:1994.9
Treatment of allylic alcohols with catalytic amounts of palladium catalysts in the presence of oxygen leads to the formation of α,β-unsaturated carbonyl compounds.
在氧气存在下用催化量的钯催化剂处理烯丙醇会导致形成α,β-不饱和羰基化合物。
Palladium(0)-catalyzed cyclization-carbonylation of 2,7-octadienyl acetate and homologues
The palladium(0)-catalyzed carbonylations, in acetic acid as a necessary solvent, of 2,7-octadienyl acetate and homologues via pi-allylpalladium species were preceded by their intramolecular oelfin insertion to form mixtures of cis/trans-2-vinylcyclopentylacetyl- and cis/trans-cyclohexylacetylpalladium intermediates, which undergo further the intramolecular (5-exo) Heck reaction to give bicyclo-[3.3.0] and [4.3.0] skeletons, respectively, except for one case affording trans-2-vinylcyclopentylacetic acid as a major product.