4-Fluorobenzaldehyde → HCID 67002067, compound

Participants

Reaction Steps

2,3,4,4a,6,7-Hexahydropyrazino[1,2-a][1,4]benzodiazepin-5(1H)-one (680.0 mg, 3.13 mmol, Example 2A) was dissolve in methanol (15 mL). 4-Fluorobenzaldehyde (653.5 mg, 5.27 mmol) was added to the reaction and stirred at ambient temperature for 1 hour. Sodium cyanoborohydride (565.3 mg, 9.00 mmol) was then added, and the reaction was stirred at ambient temperature for 17 hours. The reaction was then diluted with 1 M NaOH (50 mL) and extract with dichloromethane (3×50 mL). The organic layers were combined, and purified by silica gel chromatography (ethyl acetate, Rf 0.40) to give the title compound: 1H NMR (400 MHz, benzene-d6) δ ppm 1.93 (td, J=11.0, 2.8 Hz, 1H), 2.42 (t, J=10.6 Hz, 1H), 2.49-2.51 (m, 1H), 2.60 (dt, J=11.0, 2.6 Hz, 1H), 2.85 (td, J=11.2, 2.9 Hz, 1H), 3.02-3.10 (m, 2H), 3.30 (d, J=13.2 Hz, 1H), 3.50 (dt, J=10.7, 2.3 Hz, 1H), 3.75 (dd, J=10.4, 2.8 Hz, 1H), 4.51 (dd, J=13.6, 4.0 Hz, 1H), 6.72-6.73 (d, J=8.1 Hz, 1H), 6.75 (dd, J=7.3, 1.5 Hz, 1H), 6.81-6.84 (m, 3H), 7.02-7.09 (m, 3H); MS (DCI/NH3) m/z 326 (M+H)+.

Provenance & Evidence