反应条件
1: 1.) morpholine, 80 deg C, 1 h, 2.) morpholine, water, 100 deg C, 1 h
2: 98 percent / CH3ONa / tetrahydrofuran / 20 h / Ambient temperature
3: 97 percent / glacial CH3COOH, H2O / tetrahydrofuran / 18 h / 70 °C
4: 90 percent / H2 / Raney Ni / methanol / 8 h / 100 °C
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