hydrazine hydrate; acetic acid 1.) MeOH, reflux, 10 min, 2.) MeOH, from 50 to 60 deg C, 30 min; Yield given. Multistep reaction;

1: 1.) AcOH, 2.) hydrazine hydrate / 1.) MeOH, reflux, 10 min, 2.) MeOH, from 50 to 60 deg C, 30 min 2: 1.) oxalyl chloride, DMSO, 2.) Et3N / 1.) CH2Cl2, -60 deg C, 15 min, 2.) CH2Cl2, -60 deg C, 5 min View Scheme