[Cl:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([C:11]([CH3:13])=[CH2:12])[N:10]=1)[C:5]([OH:7])=[O:6].[N+](=[CH:16][Si](C)(C)C)=[N-]>ClCCl.CO>[Cl:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([C:11]([CH3:13])=[CH2:12])[N:10]=1)[C:5]([O:7][CH3:16])=[O:6]To a solution of 2-chloro-6-isopropenylisonicotinic acid (0.25 g, 1.27 mmol) in dichloromethane (4.7 mL) and methanol (1.6 mL) was added (diazomethyl)(trimethyl)silane (0.63 mL, 1.27 mmol). After the addition, the mixture was concentrated and carried onto the next step. MS 212.0 (M+1).
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