反应详情

A solution of 2-chloroquinoline-3-carbonyl chloride (2.72 g, 12.04 mmol) in methylene chloride (37.7 mL) was added dropwise to a mixture of methyl 5-aminopyridine-2-carboxylate (1.83 g, 12.04 mmol), pyridine (2.9 mL, 36.12 mmol) and methylene chloride (25.1 mL) at 0° C. The mixture was stirred and allowed to warm up to room temperature over 1.5 hours. To the reaction slurry, water (30 mL) was added and a precipitate formed. The solid was filtered, washed with water (2×30 mL), hexanes (2×50 mL), and a small amount of dichloromethane. The solid from the filtrate was isolated and washed with water (1×15 mL) and hexanes (1×20 mL). This solid obtained was dried in the vacuum oven to yield methyl 5-(2-chloroquinoline-3-carboxamido)picolinate (3 g, 73%). ESI-MS m/z calc. 341.06, found 342.2 (M+1)+; Retention time: 1.18 minutes (3 minutes run). 1H NMR (400 MHz, DMSO-d6) δ 11.36 (s, 1H), 8.95 (d, J=2.5 Hz, 1H), 8.85 (s, 1H), 8.42 (dd, J=8.6, 2.5 Hz, 1H), 8.21-8.12 (m, 2H), 8.07 (dd, J=8.6, 1.1 Hz, 1H), 8.02-7.89 (m, 1H), 7.82-7.72 (m, 1H), 3.89 (s, 3H) ppm.

1. customa precipitate formed
2. filtrationThe solid was filtered
3. washwashed with water (2×30 mL), hexanes (2×50 mL)
4. customThe solid from the filtrate was isolated
5. washwashed with water (1×15 mL) and hexanes (1×20 mL)
6. customThis solid obtained
7. customwas dried in the vacuum oven