Tetrahydropyran-4-ylmethyl trifluoromethanesulfonate → tert-Butyl 2-[4-(5-chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]-3-(tetrahydro-2H-pyran-4-yl)propanoate

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1.65 g (4.41 mmol) of tert-butyl [4-(5-chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]acetate, 1.64 g (6.61 mmol) of tetrahydro-2H-pyran-4-ylmethyl trifluoromethanesulphonate and 5.73 ml (5.73 mmol) of bis(trimethylsilyl)lithium amide (1M in THF) in 37 ml of THF were reacted according to General Method 7B. Purification by column chromatography (80 g silica cartridge, flow rate: 60 ml/min, cyclohexane/ethyl acetate gradient) gave the title compound. Yield: 1.57 g (73% of theory)

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