反应详情

A solution of benzyl 2-(3,4-diaminobenzoyl)benzoate (25 g, 72 mmole) and 1,3-bis(methoxy carbonyl)-2-methyl-2-thiopseudourea (19.3 g, 94 mmole) in acetic acid (100 ml) was heated to 75° C. for 45 minutes. The solution was cooled to room temperature and concentrated in-vacuo. The resultant oil was diluted in ethyl acetate (300 mL) and washed with 1N sodium hydroxide (200 mL), water (2×200 mL), dried over sodium sulfate, filtered and concentrated in-vacuo. The resultant solid was re-crystallized using ethyl ether and ethyl acetate (2:1). The solid was isolated by vacuum filtration and washed ethyl ether to afford [5-(2-benzylcarbanoyl-benzoyl)-1H-benzoimidazol-2-yl]-carbamic acid methyl ester, 21.4 g, 49.8 mmol, (69%) as a yellow solid. 1H NMR (400 MHz, d6-DMSO): 8.04 (br s, 1H), 7.77-7.68 (m, 3H), 7.52-7.41 (m, 3H), 7.28-7.10 (m, 5H), 5.05 (s, 2H), 3.76 (s, 3H); MS (EI) for C—24H20N4O4: 430 (MH+)

1. concentrationconcentrated in-vacuo
2. additionThe resultant oil was diluted in ethyl acetate (300 mL)
3. washwashed with 1N sodium hydroxide (200 mL), water (2×200 mL)
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in-vacuo
7. customThe resultant solid was re-crystallized
8. customThe solid was isolated by vacuum filtration
9. washwashed ethyl ether