반응 #2328951
ord-1d67b0ee5515480a87ae40765076fe9b
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후처리
- 1workup.STIRRINGThe mixture was stirred for 16 h
- 2추출extracted with ethyl acetate
- 3건조The combined extracts were dried (Na2SO4)
- 4여과filtered
- 5농축concentrated
- 6기타The residue was partially purified by column chromatography (silica gel, 5-50% ethyl acetate in hexanes)
실험 절차
4-(3-Iodo-propoxy)-2-methyl-benzaldehyde. 1-Bromo-3-chloropropane (5.03 g, 32.0 mmol, 1.0 equiv) was added to a solution of 2-methyl-4-hydroxybenzaldehyde (4.35 g, 32.0 mmol, 1.0 equiv) and K2CO3 (8.8 g, 64.0 mmol, 2.0 equiv) in acetonitrile (75 mL). The mixture was heated at 65° C. for 16 h, then cooled to rt and filtered through diatomaceous earth. The filtrate was concentrated and the residue was purified by column chromatography (silica gel, 10% ethyl acetate in hexanes) to afford 5.58 g (82%) of 4-(3-chloro-propoxy)-2-methyl-benzaldehyde. To a refluxing solution of 4-(3-chloro-propoxy)-2-methyl-benzaldehyde in acetone (100 mL), KI (58 g) was added portion wise over 3 d. The mixture was cooled to rt and water was added. The aqueous mixture was extracted three times with ethyl acetate and the combined extracts were dried (Na2SO4), filtered, and concentrated. The residue was purified by column chromatography (silica gel, 5% ethyl acetate in hexanes) to afford 6.13 g (77%) of the title compound. 1H NMR (400 MHz, CD3OD): 10.1 (s, 1H), 7.75 (d, J=8.6 Hz, 1H), 6.84 (dd, J=8.6, 2.5 Hz, 1H), 6.74 (d, J=2.2 Hz, 1H), 4.11 (t, J=5.8 Hz, 2H), 3.36 (t, J=6.7 Hz, 2H), 2.65 (s, 3H), 2.29 (m, 2H). B. 4-{3-[4-(6-Chloro-4-methyl-1H-benzoimidazol-2-yl)-3-methyl-phenoxy]-propyl}-[1,4]diazepan-5-one. To a stirred solution of 5-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester (3.0 g, 14.0 mmol, 1.0 equiv) in DMF (45 mL) at rt was added 60% sodium hydride (560 mg, 14.0 mmol, 1.0 equiv). After stirring for 30 min, 4-(3-iodo-propoxy)-2-methyl-benzaldehyde (4.26 g, 14.0 mmol, 1.0 equiv) was added as a solution in DMF (5 mL). The mixture was stirred for 16 h and then poured into water and extracted with ethyl acetate. The combined extracts were dried (Na2SO4), filtered, and concentrated. The residue was partially purified by column chromatography (silica gel, 5-50% ethyl acetate in hexanes) to afford 4-[3-(4-formyl-3-methyl-phenoxy)-propyl]-5-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester as a mixture with several unidentified products. This impure mixture (200 mg), 5-chloro-3-methyl-benzene-1,2-diamine (80.1 mg), and Na2S2O5 (97 mg) were stirred in DMF (1.0 mL) at 90° C. for 3 h. After cooling to rt, the reaction mixture was loaded on silica gel and was purified by Method 2 to afford 4-{3-[4-(6-chloro-4-methyl-1H-benzoimidazol-2-yl)-3-methyl-phenoxy]-propyl}-5-oxo-[1,4]diazepane-1-carboxylic acid tert-butyl ester as a mixture with several unidentified products. This mixture was dissolved in dichloromethane (1.0 mL) and TFA (1.0 mL) and stirred at rt for 1 h. The reaction mixture was loaded on silica gel and purified by Method 2 to afford 91.0 mg (42%) of the title compound. MS (electrospray): mass calculated for C23H27ClN4O2, 426.18; m/z found, 427.4 [M+H]+. 1H NMR (400 MHz, CD3OD): 7.55 (d, J=8.5 Hz, 1H), 7.42 (br s, 1H), 7.09-7.06 (m, 1H), 6.97 (d, J=2.4 Hz, 1H), 6.93 (dd, J=8.5, 2.5 Hz, 1H), 4.10 (t, J=6.1 Hz, 2H), 3.67-3.56 (m, 4H), 2.98-2.89 (m, 4H), 2.72-2.66 (m, 2H), 2.59 (s, 3H), 2.50 (s, 3H), 2.12-2.01 (m, 2H).