[Br:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]([C:8]([OH:10])=O)[CH:3]=1.[NH2:11][C:12]1[CH:13]=[C:14]([C:17]([O:19][CH3:20])=[O:18])[S:15][CH:16]=1.C[NH3+].F[P-](F)(F)(F)(F)F.N1(OC(N(C)C)=[N+](C)C)C2N=CC=CC=2N=N1.F[P-](F)(F)(F)(F)F.CN1CCOCC1>CN(C)C=O>[Br:1][C:2]1[CH:7]=[CH:6][N:5]=[C:4]([C:8]([NH:11][C:12]2[CH:13]=[C:14]([C:17]([O:19][CH3:20])=[O:18])[S:15][CH:16]=2)=[O:10])[CH:3]=1
A solution of 4-bromo-pyridine-2-carboxylic acid (1.98 g, 9.80 mmol), methyl 4-aminothiophene-2-carboxylate (1.40 g, 8.91 mmol), 2-(1H-7-Azabenzotriazol-1-yl)-1,1,3,3-tetramethyl uronium hexafluorophosphate methanaminium (HATU) (4.07 g, 10.7 mmol), and N-methylmorpholine (1.18 mL, 10.7 mmol) in N,N-dimethylformamide (18 mL) was stirred at room temperature for 6 hours. The solvent was removed under reduced pressure, the residue suspended in acetonitrile, and the solids were isolated by filtration. The solids were washed with water (80 mL), acetonitrile (80 mL) and diethyl ether (80 mL), and dried under reduced pressure to afford methyl 4-(4-bromopicolinamido)thiophene-2-carboxylate, a compound of formula (19) as a white powder (2.70 g, 90% yield). M+1=341.1.
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