Multi-step reaction with 5 steps
1.1: sulfuric acid / acetic acid / 0.17 h / 0 °C
1.2: 0.5 h
1.3: 2.5 h / 0 - 20 °C
2.1: sulfuric acid / water; acetic acid / 5 h / Heating / reflux
2.2: pH 10
2.3: pH 1
3.1: O-<[cyano(ethoxycarbonyl)methylene]amino>-1,1,3,3-tetramethyluronium tetrafluoroborate; N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 2 h / 20 °C
4.1: ammonium acetate; sodium cyanoborohydride / methanol / 3 h / Heating / reflux
5.1: O-<[cyano(ethoxycarbonyl)methylene]amino>-1,1,3,3-tetramethyluronium tetrafluoroborate; N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 2 h / 20 °C
With
O-<[cyano(ethoxycarbonyl)methylene]amino>-1,1,3,3-tetramethyluronium tetrafluoroborate; sulfuric acid; ammonium acetate; sodium cyanoborohydride; N-ethyl-N,N-diisopropylamine;
In
methanol; water; acetic acid; N,N-dimethyl-formamide;