[CH2:1]([S:8][C:9]1[N:13]=[C:12]([SH:14])[NH:11][N:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl[CH2:16][C:17](=O)[CH3:18].CCOCC.C(=O)(O)[O-].[Na+]>C(O)C>[CH2:1]([S:8][C:9]1[N:13]=[C:12]2[S:14][CH:16]=[C:17]([CH3:18])[N:11]2[N:10]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1The product of stage (a) (22.3 g) and chloroacetone (9.6 g) were heated in ethanol (120 ml) under reflux for 22 hours. The solution was then reduced under vacuum, and the residue was stirred with a mixture of ether and aqueous sodium bicarbonate. The ether solution was separated, washed with water, dried over magnesium sulphate, and reduced under vacuum to give 24.1 g of the desired product as an orange oil.
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