4-Chloropyridine-2-carboxamide → 4-(4-Amino-2-fluorophenoxy)picolinamide

HRID 1986066Notes

Reaction equation

[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[C:4]([F:9])[CH:3]=1.CC(C)([O-])C.[K+].Cl[C:17]1[CH:22]=[CH:21][N:20]=[C:19]([C:23]([NH2:25])=[O:24])[CH:18]=1>CN(C=O)C>[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][C:17]2[CH:22]=[CH:21][N:20]=[C:19]([C:23]([NH2:25])=[O:24])[CH:18]=2)=[C:4]([F:9])[CH:3]=1

Participants

Conditions

Temperature: 110 °C

Procedure

A solution of 4-amino-2-fluorophenol (0.81 g, 6.4 mmol, 1.0 eq) in DMF (6.5 mL) was treated with potassium tert-butoxide (0.79 g, 7.1 mmol, 1.1 eq) at room temperature and the reaction mixture was stirred for 1 h. 4-Chloropicolinamide (1.0 g, 6.4 mmol, 1.0 eq) was added and the reaction mixture was heated to 110° C. for 8 h. The reaction was cooled to room temperature and the reaction mixture quenched with water. The resulting heterogeneous solution was filtered and the solid material was washed with water. The solid was triturated with a small amount of MeOH followed by Et2O. The solid was filtered and dried in vacuo to afford the desired product (1.3 g, 82%) as a solid. 1H NMR (DMSO-d6) δ 8.49-8.50 (m, 1H), 8.12 (br s, 1H), 7.71 (br s, 1H), 7.35-7.36 (m, 1H), 7.14-7.16 (m, 1H), 7.01-7.06 (m, 1H), 6.44-6.47 (m, 2H), 5.53 (s, 2H); MS(ESI+) m/z 248 (M+H)+.

Workup

temperatureThe reaction was cooled to room temperature
customthe reaction mixture quenched with water
filtrationThe resulting heterogeneous solution was filtered
washthe solid material was washed with water
customThe solid was triturated with a small amount of MeOH
filtrationThe solid was filtered
customdried in vacuo

Sources & evidence

ORD record: ord-ccc02573fd3e4e339e068554e9ec24f9
Source dataset: uspto-grants-2009_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07547782B2

Reaction notes

Loading…