反应详情

To a solution of 7.5 g piperazine-1,4-dicarboxylic acid propyl ester tert-butyl ester in 70 ml dichloromethane were added 10 ml TFA. After stirring for 36 h the solution was concentrated and the residue codistilled with toluene twice. Yield: 9.2 g.

1. concentrationwas concentrated