反应详情

A 50 milliliter flask with a magnetic stirring bar, addition funnel, thermometer and condenser/drying tube was charged with 3.0 grams (0.021 mole) of 5-(1,1-dimethylethyl)-3-isoxazolamine, a few crystals of 4-dimethylaminopyridine and 20 milliliters of benzene. The funnel was charged with 2.3 grams (0.040 mole) of methyl isocyanate in 5 milliliters of benzene, which was added dropwise over five (5) minutes. After standing overnight, the mass of crystals which formed was isolated by filtration, washed with hexane, and air dried to give 3.0 grams of white powder of 1-[5-(1,1-dimethylethyl)-3-isoxazolyl]-3-methylurea, M.P. 188°-189° C.

1. additionA 50 milliliter flask with a magnetic stirring bar, addition funnel
2. customthermometer and condenser/drying tube
3. customthe mass of crystals which formed
4. customwas isolated by filtration
5. washwashed with hexane, and air
6. customdried