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温度

0 °C

Compound 450 (0.367 g, 0.60 mmol) was dissolved in dichloromethane (2 mL) at RT and then Et3N (0.25 mL, 1.803 mmol) was added. The reaction mixture was cooled to 0° C., treated with isocyanatomethane (0. 16 mL, 3.43 mmol) and stirred for 10 min at 0° C. The reaction mixture was then warmed to RT over a 30 min period, and then was quenched with MeOH. It was then concentrated to dryness and the residue was purified by flash chromatography (eluent 9/1/10 MeOH/NH4Cl/DCM) to give title compound 455 as a pale yellow solid (0.16 g, 39% yield). 1H NMR δ (400 MHz, DMSO-d6): 12.48 (s, 1H), 11.83 (s, 1 H), 8.51 (dd, J=1.2, 5.5 Hz, 1H), 8.01 (m, 2H), 7.84 (m, 2H), 7.53 (m, 2H), 7.42 (d, J=8.4 Hz, 2H), 7.23-7.38 (m, 5H) 6.65 (dd, J=0.8, 5.5 Hz, 1H), 6.39 (q, J=4.2 Hz, 1 H), 3.81 (s, 2 H), 3.51 (s, 2H), 3.25 (m, 4H), 2.53 (d, J=4.3 Hz, 3H), 2.31 (m, 4H). LCMS: 669 (M+H)+.

1. temperatureThe reaction mixture was then warmed to RT over a 30 min period
2. customwas quenched with MeOH
3. concentrationIt was then concentrated to dryness
4. customthe residue was purified by flash chromatography (eluent 9/1/10 MeOH/NH4Cl/DCM)