1: N-ethyl-N,N-diisopropylamine; O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; benzotriazol-1-ol / water / 60 °C / |Microwave irradiation 2: hydrogenchloride / water / 0.25 h / 25 °C 3: N-ethyl-N,N-diisopropylamine; O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; benzotriazol-1-ol / water / 60 °C / |Microwave irradiation 4: hydrogenchloride / water / 0.25 h / 25 °C 5: N-ethyl-N,N-diisopropylamine; O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; benzotriazol-1-ol / water / 60 °C / |Microwave irradiation 6: palladium 10 on activated carbon; ammonium formate / methanol / |Reflux View Scheme