反应详情

温度

-10 °C

7-Bromo-3-methyl-5-phenyl-1,3-dihydrobenzo[e][1,4]diazepin-2-one 111 (16.6 g, 0.052 mol) was suspended in dry THF (250 mL) and cooled to −10° C. Sodium hydride (60% dispersion in mineral oil, 4.36 g, 0.109 mol) was added into the suspension in one portion. The reaction mixture was allowed to stir and warm to rt over a 3 h period. The reaction mixture was again cooled to −10° C. and diethyl chlorophosphate (12.7 ml, 0.09 mol) was added. The cooling bath was then removed and stirring continued for 3 h. At this time, sodium hydride (60% dispersion in mineral oil, 4.2 g, 0.1 mol) was suspended in dry THF (250 mL) at −10° C. in another flask. Ethyl isocyanoacetate (6.78 mL, 0.06 mol) was added to the NaH/THF suspension, the solution which resulted was allowed to stir for 3 h. After 3 h the first flask was cooled to −30° C. and the solution in the 2nd reaction flask was added to the first flask via a cannula. The reaction mixture was allowed to stir for 24 h, and then cooled with an ice-water bath and slowly quenched with acetic acid (10 mL). Water was added to the reaction mixture after which it was extracted with EtOAc. The EtOAc layers were combined, washed with aq NaHCO3, brine and dried (Na2SO4). After removal of the solvent under reduced pressure, the solid was purified by flash chromatography (silica gel, EtOAc:hexane, gradient elution 1:2, 1:1, 2:1). The ester 112 was a white solid (8.76 g, 40%). mp 164-165° C.; IR (KBr, cm−1) 2925, 1706, 1622, 1557, 1495, 1266, 1185; 1H NMR (CDCl3) δ 7.89 (s, 1 H), 7.73 (dd, J=1.73 Hz, 1 H), 7.51-7.36 (m, 7 H), 6.66 (q, J=7.30, 1 H), 4.45-4.30 (m, 2 H), 1.40 (t, J=7.11, 3 H), 1.25 (d, J=7.38 Hz, 3H). MS (EI) m/e (relative intensity) 426 (M++2, 15), 425 (M++1, 58), 424 (M+, 15), 423 (58), 380 (24), 379 (71), 378 (35), 377 (69), 352 (50), 351(100), 350 (67), 349 (92), 270 (38), 229 (16); [α]26D=−38.0 (c 0.45, EtOAc).

1. temperaturewarm to rt over a 3 h period
2. temperatureThe reaction mixture was again cooled to −10° C.
3. customThe cooling bath was then removed
4. stirringstirring
5. customthe solution which resulted
6. stirringto stir for 3 h
7. temperatureAfter 3 h the first flask was cooled to −30° C.
8. customthe solution in the 2nd reaction flask
9. additionwas added to the first flask via a cannula
10. stirringto stir for 24 h
11. temperaturecooled with an ice-water bath
12. customslowly quenched with acetic acid (10 mL)
13. additionWater was added to the reaction mixture after which it
14. extractionwas extracted with EtOAc
15. washwashed with aq NaHCO3, brine
16. dry with materialdried (Na2SO4)
17. customAfter removal of the solvent under reduced pressure
18. customthe solid was purified by flash chromatography (silica gel, EtOAc:hexane, gradient elution 1:2, 1:1, 2:1)