反应详情

温度

-78 °C

(Z)-7-Chloro-1-(4-methoxybenzyl)-5-(4-methoxyphenyl)-1H-benzo[e][1,4]diazepin-2(3H)-one (0.344 g, 0.817 mmol) was dissolved in dry THF (8 mL) and cooled to −78° C. under nitrogen. Potassium tert-butoxide (0.119 g, 1.063 mmol) was added in one portion. The reaction mixture was stirred for 5 min. turning deep red. 2-chlorobenzylbromide (0.128 mL, 0.981 mmol) was added by syringe. The mixture was stirred at −78° C. for 1.5 h then the cold bath was removed. After 1 h, the reaction was quenched with methanol and diluted with ethyl acetate. The organic layer was washed with water (2×) then brine and dried (MgSO4). Chromatography on silica gel eluting with 25-30% ethyl acetate in hexanes gave (Z)-7-chloro-3-(2-chlorobenzyl)-1-(4-methoxybenzyl)-5-(4-methoxyphenyl)-1H-benzo[e][1,4]diazepin-2(3H)-one (128 mg, 29%). 1H NMR (300 MHz, CDCl3) δ 3.6-3.8 (m, 2H), 3.7 (s, 3H), 3.8 (s, 3H), 3.9-4.0 (m, 1H), 4.55 (d, 1H), 5.7 (d, 1H), 6.6 (d, 2H), 6.8-6.9 (m, 4H), 7.1-7.4 (m, 8H), 7.6 (dd, 1H); ESI m/z.

1. stirringThe mixture was stirred at −78° C. for 1.5 h
2. customthe cold bath was removed
3. waitAfter 1 h
4. customthe reaction was quenched with methanol
5. additiondiluted with ethyl acetate
6. washThe organic layer was washed with water (2×)
7. dry with materialbrine and dried (MgSO4)