2,5-Dichloropyridine → HCID 86680444, compound

Participants

Reaction Conditions

Reaction Steps

(8R*,8aR*)-tert-Butyl 8-hydroxyhexahydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate (Example 36A, 0.969 g, 4.0 mmol) and 2,5-dichloropyridine (0.651 g, 4.40 mmol) were treated with potassium tert-butoxide (0.987 g, 8.80 mmol) in dry tetrahydrofuran (5 mL). The mixture was heated to 80° C. and stirred for 16 hours. After the mixture cooled to room temperature, the mixture was purified via HPLC (Gilson®, Xbridge™ 30×100 mm column, eluted with pH=10 aqueous ammonium bicarbonate-ammonium hydroxide/methanol, UV=222 nm) to give the tert-butoxycarbonyl protected product, (8R*,8aR*)-tert-butyl 8-(5-chloropyridin-2-yloxy)hexahydropyrrolo[1,2-a]pyrazine-2(1H)-carboxylate. This tert-butoxycarbonyl compound was dissolved in dichloromethane (5 mL) and trifluoroacetic acid (2 mL) was added. The reaction mixture was stirred at room temperature for 3 hours. The mixture was concentrated and then purified via HPLC (Gilson®, Xbridge™ 30×100 mm column, eluted with pH=10 aqueous ammonium bicarbonate-ammonium hydroxide/methanol, UV=220 nm) to give the title compound. 1H NMR (300 MHz, methanol-d4) δ ppm 1.72-1.86 (m, 1H), 2.08-2.22 (m, 3H), 2.31-2.45 (m, 1H), 2.69-2.80 (m, 2H), 2.87-2.98 (m, 1H), 2.99-3.21 (m, 3H), 5.51 (ddd, 1H, J=7, 4, 2 Hz), 6.77 (d, 1H, J=9 Hz), 7.65 (dd, 1H, J=8, 2 Hz), 8.07 (d, 1H, J=2 Hz); MS (DCI) m/z 254 (M+H)+.

Provenance & Evidence