[CH2:1]([O:3][C:4](=[O:12])[C:5]1[CH:10]=[CH:9][C:8]([NH2:11])=[N:7][CH:6]=1)[CH3:2].C([N:21]=[C:22]=[S:23])(=O)C1C=CC=CC=1.[O-]CC.[Na+]>C1COCC1.C(O)C>[CH2:1]([O:3][C:4](=[O:12])[C:5]1[CH:10]=[CH:9][C:8]([NH:11][C:22]([NH2:21])=[S:23])=[N:7][CH:6]=1)[CH3:2]A mixture of ethyl-6-amino-nicotinate (2.5 g, 15 mmol) and benzoyl isothiocyanate (2.45 g, 15 mmol) in THF (20 mL) was heated at 40° C. for 4 h. To this mixture at RT, was added sodium ethoxide (2.04 g, 30 mmol) in ethanol (10 mL). After stirring the resulting mixture at RT for 16 h, the volatiles were removed in vacuo. The residue was suspended in aqueous NH4Cl and the solid formed was collected by filtration, rinsed with water and dried to afford 6-thioureido-nicotinic acid ethyl ester as a white solid (2.6 g, 77% yield). LC/MS; (M+H)+=226.
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