The Conversion of Amides to Esters with Meerwein'S Reagent. Application to the Synthesis of a Carfentanil Precursor.
摘要:
An efficient two step transformation of 1 degrees and 2 degrees amides to methyl and ethyl esters has been developed using trimethyl- and triethyloxonium tetrafluoroborates, and dilute acid. This methodology was applied to 1-benzyl-4-phenylamino-4-piperidinecarboxamide precursor in the synthesis of carfentanil, to produce the methyl ester in 60% yield and the ethyl ester in 80% yield.
Process for initiating radical reactions employing hydroximic acid
申请人:Akzona Incorporated
公开号:US04347342A1
公开(公告)日:1982-08-31
This disclosure relates to an improved process for initiating radical reactions employing a class of hydroximic acid derivatives as initiators. Radical reactions initiated by such hydroximic acid derivatives include copolymerization of unsaturated polyester resins and cross-linking of polyethylene. The initiators of the present disclosure have a higher degradation temperature than found with typical peroxides.