Methyl chloroformate → Methyl 2-(Difluoromethyl)-4-(2-methylpropyl)-5-[(methoxycarbonyl)thio]-6-(trifluoromethyl)-3-pyridinecarboxylate

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Reaction Steps

To a stirred solution of 3.05 g (0.0089 mol) of product of example 1 and 0.094 g (0.01 mol) of methyl chloroformate in 25 mL dry THF was added 1.16 g (0.012 mol) of triethylamine dropwise at room temperature. After stirring for 30 min, the solvent was evaporated under reduced pressure. The residue was diluted with 100 mL of water and extracted with ether (3×50 mL). The combined organic layers were washed with water, dried (MgSO4) and evaporated. Purification of the residue by preparative HPLC (5% ethyl acetate-hexane) gave 2.75 g (77%) of product as a yellow oil: nD25 1.5830.

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