反应详情

Reagent XV is prepared from ethyl o-bromomethylcinnamate by the following series of reactions. (1) The starting ester is heated with a solution of sodium cyanide in ethanol to yield ethyl o-cyanomethylcinnamate. (2) This ester is hydrogenated over a Pt or Pd catalyst to afford ethyl o-cyanomethylhydrocinnamate. (3) This ester is reduced with sodium bis(2-methoxyethoxy)aluminum hydride in benzene to yield [2-(3-hydroxypropyl)phenyl]acetonitrile. (4) The nitrile is hydrolyzed by being heated with aqueous-ethanolic sodium hydroxide solution, and the acid is esterified (ethanol and mineral acid catalyst) to give ethyl [2-(3-hydroxypropyl)phenyl]acetate. (5) This hydroxy-ester is treated with phosphorus tribromide in ether to afford reagent XV.