Palladium(II)-catalyzed coupling of allenoic acids and α,β-unsaturated carbonyl compounds through tandem intramolecular oxypalladation and conjugate addition reactions
作者:Guosheng Liu、Xiyan Lu
DOI:10.1016/s0040-4039(02)02507-8
日期:2003.1
A regioselective divalent palladium-catalyzed tandem coupling reaction of allenoic acids with α,β-unsaturated carbonylcompounds was developed. The reaction involves intramolecular oxypalladation of an allene, followed by insertion of the α,β-unsaturated carbonylcompound and protonolysis of the CPd bond to regenerate the Pd(II) species in the presence of excess halide ions. Functionalized lactones
Allene epoxidation. Oxidative cyclizations of allenyl acids
作者:Jack K. Crandall、Elisa Rambo
DOI:10.1021/jo00311a004
日期:1990.11
CRANDALL, JACK K.;RAMBO, ELISA, J. ARG. SHEM. , 55,(1990) N4, C. 5929-5930
作者:CRANDALL, JACK K.、RAMBO, ELISA
DOI:——
日期:——
Allene epoxidation: synthesis of functionalized lactones by the DMDO oxidation of allenic acids
作者:Jack K Crandall、Elisa Rambo
DOI:10.1016/s0040-4020(02)00698-1
日期:2002.8
products are formed directly from allene oxides, keto lactones are formed. The corresponding spirodioxide intermediates give lactones with appropriately situated α-hydroxyketone moieties. An understanding of the regiochemistry of the epoxidations and the subsequent cyclizations of the reactiveintermediates is developed, as are methods for the manipulation of the experimental conditions to favor the