Dimethylformamide → HCID 66905593, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of (R)-1-(6-bromobenzo[d]thiazol-2-yl)pyrrolidin-3-yl methanesulfonate (Reference Example 12, 0.50 g, 1.32 mmol), pyrrolidine (0.221 mL, 2.65 mmol), and potassium carbonate (0.549 g, 3.98 mmol) was placed in a 10 mL CEM microwave vial with a stirbar. N,N-Dimethylformamide (1.5 mL) was added, the vial was capped, and the reaction was heated to 100° C. under microwave irradiation for 15 minutes, then the cooling air was turned on and heating was continued at 70° C. for an additional 15 minutes. The reaction mixture was cooled to room temperature then partitioned between ethyl acetate and saturated aqueous sodium carbonate. The aqueous layer was extracted once more with ethyl acetate. The combined organic extracts were washed twice with brine, then dried (MgSO4) and filtered. The filtrate was concentrated under reduced pressure to give an oil that solidified on trituration with diethyl ether. The solid was collected by filtration and rinsed with diethyl ether, then purified by column chromatography on an Analogix IntelliFlash-280 (Analogix SF15-12g, 100% dichloromethane to 98:2 dichloromethane/methanol). Fractions containing product were combined and concentrated under reduced pressure to give a solid that was dried overnight in a vacuum oven at 70° C. to give (S)-2-(1,3′-bipyrrolidin-1′-yl)-6-bromobenzo[d]thiazole. 1H NMR (300 MHz, CD3OD) δ ppm 1.78-1.93 (m, 4H), 2.01-2.15 (m, 1H), 2.26-2.37 (m, 1H), 2.58-2.74 (m, 4H), 3.00-3.11 (m, 1H), 3.40-3.48 (m, 1H), 3.49-3.60 (m, 1H), 3.66-3.83 (m, 2H), 7.35 (d, J=9 Hz, 2H), 7.40 (dd, J=2, 9 Hz, 1H), 7.81 (d, J=2 Hz, 1H); MS (DCI/NH3) m/z 352 (M+H)+.

Provenance & Evidence