[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]([C:9]([NH2:11])=[O:10])=[N:7][CH:8]=1.[Na].C(S)C.[Cl:16][C:17]1[CH:24]=[CH:23][C:20](CCl)=[CH:19][CH:18]=1.ClC1C=CC(CCl)=CC=1.CN(C=O)C>CN(C=O)C.C(OCC)(=O)C>[Cl:16][C:17]1[CH:24]=[CH:23][C:20]([CH2:1][O:2][C:3]2[CH:4]=[CH:5][C:6]([C:9]([NH2:11])=[O:10])=[N:7][CH:8]=2)=[CH:19][CH:18]=1
To 5-methoxy-2-pyridylcarboxamide (2 g, 13.2 mmol) in 5 ml of DMF at RT is added the sodium salt of ethanethiol (26.3 mmol) in DMF (61.5 ml). The slurry is heated to 110° with stirring for about 15 minutes. The reaction is cooled to 50° and 40 ml of DMF is added. After 0.5 hour, the reaction is cooled to 10° & 4-chlorobenzyl chloride (2.47 g, 15.4 mmol) is added. The reaction is allowed to warm to RT and is stirred for 3 days. About 0.5 ml of 4-chlorobenzyl chloride/DMF (0.21 g/l ml) is added. After 2 hours at RT, the reaction is poured into ice water and ethyl acetate. The ethyl acetate is separated off, and the water layer is extracted with ethyl acetate (4X). The combined organic layers are washed with water and with brine, dried, filtered and rotoevaporated. The residue is washed with 20% ether/hexane (4X). The liquid is pipetted off and the residue is rotoevaporated to give 5-(4-chlorobenzyloxy)-2-pyridylcarboxamide.
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