作者:Ronald Grigg、James Redpath、Visuvanathar Sridharan、David Wilson
DOI:10.1016/s0040-4039(00)78369-9
日期:1994.10
Palladiumcatalysed processes involving sequential carbonylation-cyclisation-carbometallation-anion capture from Sn(IV) and B(III) are described. These molecular queuing processes occur in good yield under 1 atm. of carbon monoxide. Reactivity/selectivity guidelines are delineated for carbopalladation, acylpalladation and anion capture.
Regiospecific pentamolecular queuing cascades involving formation of 5 new bonds and cycloacylpalladation have been achieved. The processes employ vinyl and aryl halide or triflate starter species together with allenes and carbon monoxide (1 atm) and both preformed and in situ generated Pd(0) catalysts.
Alkynes are shown to be versatile substrates for palladiumcatalysedcascade cycloaddition/formal Friedel-Crafts vinylation/alkylation reactions. Examples in which two or three new rings are created and annulated onto arenes are described.
palladium-catalyzed asymmetric carbonylative Heck esterification method. This approach facilitates the efficient synthesis of various chiral γ-ketoacid esters by utilizing o-alkenyliodobenzenes and arylboronic acids as primary substrates. This reaction achieves the creation of three carbon–carbon bonds, two carbon–oxygen bonds, and the establishment of a quaternary carbon center within a single step