[Cl:1][CH2:2][CH2:3][CH2:4][O:5][C:6]1[CH:11]=[CH:10][C:9]([C:12](=[S:14])[NH2:13])=[CH:8][CH:7]=1.[CH3:15][O:16][C:17](=[O:23])[CH:18](Cl)[C:19]([CH3:21])=O>CO.ClCCl>[Cl:1][CH2:2][CH2:3][CH2:4][O:5][C:6]1[CH:11]=[CH:10][C:9]([C:12]2[S:14][C:18]([C:17]([O:16][CH3:15])=[O:23])=[C:19]([CH3:21])[N:13]=2)=[CH:8][CH:7]=1A mixture of 4-(3-chloropropoxy)benzenecarbothioamide ax71 (34.67 mmol, 1 eq, 7.96 g), and 2-chloroacetoacetic acid methyl ester (34.67 mmol, 1 eq, 5.2 g) in methanol is stirred at 70° C. for 2 hours. The reaction mixture is then poured into a sealed tube and stirred at 100° C. for 3 hours. The mixture is taken up in dichloromethane and washed with water then dried over magnesium sulfate. The solvent is removed under reduced pressure to give 11.8 g of methyl 2-[4-(3-chloropropoxy)phenyl]-4-methyl-1,3-thiazole-5-carboxylate i105. The product is used as such in the next step.
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