Cl[C:2]1[C:7]([C:8]#[N:9])=[CH:6][CH:5]=[CH:4][N:3]=1.[SH:10][CH2:11][C:12]([O:14][CH2:15][CH3:16])=[O:13].C(=O)([O-])[O-].[Na+].[Na+].CCO>O>[NH2:9][C:8]1[C:7]2[C:2](=[N:3][CH:4]=[CH:5][CH:6]=2)[S:10][C:11]=1[C:12]([O:14][CH2:15][CH3:16])=[O:13]A mixture of 2-chloro-3-cyanopyridine (330 g, 2.3 mol), ethyl 2-mercaptoacetate (361.2 g, 3.0 mol), sodium carbonate (265 g, 2.5 mol) and EtOH (1.2L) was heated to reflux for 4.5 hours. The reaction mixture was cooled to ambient temperature and added to water (15L). The resultant precipitate was stirred for 30 minutes and then filtered. The filter cake was washed with two portions of water (2×2.5L) and dried to constant weight under vacuum at 45° C. to yield the title compound as a brown solid (493.1 g, 93.2%). δH (CDCl3) 8.68 (1H, dd, J 4.7, 1.2 Hz), 7.93 (1H, dd, J 8.5, 1.2 Hz), 7.29 (1H, dd, J 8.5, 4.7 Hz), 5.90 (2H, b), 4.38 (2H, q, J 7.0 Hz), 1.40 (3H, t, J 7.0 Hz). LCMS RT 2.9 minutes, 223 (M+H)+.
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