反应详情

In a round bottom flask, a mixture of 2-amino-2-methyl-3-(methylamino)propan-1-ol hydrochloride (3.3 g, 21 mmol) and urea (1.26 g, 21 mmol) were heated in a 200° C. sand bath for 1 hour until ammonia gas ceased to evolve. The resultant mixture was suspended in dichloromethane and filtered to remove insoluble material. The organic solution was concentrated to 3.3 g of black solid and purified by column chromatography, eluting from silica gel with a gradient of 1-12% methanol in dichloromethane to give 1.3 g of desired product as a tan oil (45% yield). 1H NMR (400 MHz, CDCl3) δ1.26 (s, 3H), 2.76 (s, 3H), 3.07-3.9 (d, J=8.8 Hz, 1H), 3.36-3.36 (d, J=8.8 Hz, 1H), 3.43-3.44 (d, J=2.1 Hz, 2H), 3.46 (s, 1H). 13C NMR (100 MHz, CDCl3/MeOD) δ 23.5, 30.1, 50.0, 55.7, 67.7, 161.9. LRMS (ESI/APCI): 145 [M+H]+.

1. filtrationfiltered
2. customto remove insoluble material
3. concentrationThe organic solution was concentrated to 3.3 g of black solid
4. custompurified by column chromatography
5. washeluting from silica gel with a gradient of 1-12% methanol in dichloromethane