反应详情

A solution of methyl 3-[bis(tert-butoxycarbonyl)amino]-6-(1-tert-butoxycarbonyl-3,6-dihydro-2H-pyridin-4-yl)pyrazine-2-carboxylate (700 mg, 1.3 mmol) in methanol (28 mL) was stirred with 10% Pd/C (wet) (557 mg, 0.26 mmol) at 35° C. under an atmosphere of hydrogen for 16 h. The reaction mixture was filtered, concentrated in vacuo, and purified via silica gel column chromatography using 10-70% ethyl acetate/hexane to provide methyl 3-[bis(tert-butoxycarbonyl)amino]-6-(1-tert-butoxycarbonyl-4-piperidyl)pyrazine-2-carboxylate (285 mg) as an light orange sticky solid. 1H NMR (400 MHz, CDCl3) δ 8.52 (s, 1H), 4.28 (bs, 2H), 3.97 (s, 3H), 3.06 (t, J=12.0 Hz, 1H), 2.86 (t, J=12.0 Hz, 2H), 1.98 (d, J=12.5 Hz, 2H), 1.79 (qd, J=12.6, 3.9 Hz, 2H), 1.48 (s, 9H), 1.41 (s, 18H). LC/MS m/z 537.7 [M+H]+.

1. filtrationThe reaction mixture was filtered
2. concentrationconcentrated in vacuo
3. custompurified via silica gel column chromatography