1: LiAlH4 / diethyl ether 2: 1.) CH3CH2CO2H, 2.) KOH / 1.) reflux, 2.) MeOH, reflux, 5 h 3: 1.) HOBt, 2.) 1-<3-(dimethylamino)propyl>-3-ethylcarbodiimide / 1.) CH2Cl2, 0 deg C, 5 min, 2.) CH2Cl2, RT, overnight View Scheme

1: 1.) CH3CH2CO2H, 2.) KOH / 1.) reflux, 2.) MeOH, reflux, 5 h 2: 1.) HOBt, 2.) 1-<3-(dimethylamino)propyl>-3-ethylcarbodiimide / 1.) CH2Cl2, 0 deg C, 5 min, 2.) CH2Cl2, RT, overnight View Scheme

benzotriazol-1-ol; N'-(3-dimethylaminopropyl)-N-ethylcarbodiimide 1.) CH2Cl2, 0 deg C, 5 min, 2.) CH2Cl2, RT, overnight; Yield given. Multistep reaction;