Reaction of di(bromomagnesio)alkanes with unsymmetrically substituted cyclic anhydrides
作者:Persephone Canonne、Gilles Lemay、Denis Bélanger
DOI:10.1016/s0040-4039(00)93679-7
日期:1980.1
Alkylated γ-spirolactones were prepared in one-step reactions in high yields from butane-1,4-diyl and pentane-1,5 diyldimagnesium dibromides and substituted cyclicanhydrides in tetrahydrofuran. In the light of experimental findings electronic and steric factors influence the regiospecificity of this reaction.
Asymmetric hydrogenation of various 3-substituted maleic anhydrides catalyzed by Rh/bisphosphine-thiourea (ZhaoPhos) under mild conditions was successfully developed. A wide range of 3-alkyl and 3-aryl maleic anhydrides was hydrogenated well to...
Synthesis of New Optically Active and Racemic Phenylsuccinamic Acids
作者:R. Stephani、V. Cesare、I. Sadarangani、I. Lengyel
DOI:10.1055/s-2002-19294
日期:——
characterization of new (S)-(+)- and racemic phenylsuccinamic acids, obtained from the reaction of (S)-(+)-phenylsuccinic anhydride (1) with five different primary amines (2a-e) is described.Ring opening of anhydride 1 led to the formation of two isomeric phenylsuccinamic acid products with the phenyl substituent β to the amide function being the preferred product. Complete racemization occurred with all of the