反应条件
1: 92 percent / hydroxylamine hydrochloride, sodium formiate / formic acid / 1 h / Heating
2: 80 percent / K2CO3 / dimethylformamide / 3 h / 155 - 160 °C
3: 90 percent / piperidine / 24 h / 100 °C
4: 34 percent / triethylphosphite / 20 h / Heating
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