反应详情

2,6-Diisopropylphenylisocyanate (0.24 g) and the product of Example 6 (0.45 g) were mixed and then diluted with a few mL of ethyl acetate. The solution was heated on the steambath and then concentrated to an oil which was heated on the steambath. Upon cooling to room temperature the oil partially solidified. Addition of hexane/EtoAc, 1/1 caused crystallization of the product which was collected by filtration. 0.30 g (44%). NMR (CDCl3) δ 1.08 (12H ,d), δ 1.17 (12H, d), δ 1.60-2.13 (8H, m), δ 2.65 (2H, m), δ 3.04 (2H, m), δ 3.71 (2H, s), δ 4.04 (2H, bs), δ 5.24 (1H, bs), δ 7.04-7.48 (11H, m), δ 7.94 (1H, bs). IR (KBr) 3025, 2965, 2871, 1682, 1637, 1519, 1364, 1230, 958, 801, 700 cm-1.

1. temperatureThe solution was heated on the steambath
2. concentrationconcentrated to an oil which
3. temperaturewas heated on the steambath
4. additionAddition of hexane/EtoAc, 1/1
5. customcrystallization of the product which
6. filtrationwas collected by filtration