Tetrahydrofuran → 3-[2-Chloro-3-methyl-5-pivaloylamino-4-pyridyl]-1,1-diethoxy-2-hydroxy-2-phenylpropane

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144.3 g (0.6 mol) of 2-chloro-3,4-dimethyl-5-pivaloylaminopyridine are dissolved in 2.9 1 of abs. THF and the solution is treated under argon at -78° C. with 127 ml of a 10.4N solution of n-BuLl in n-hexane (1.32 mmol). The mixture is stirred at 0° C. for 3 h, 129.8 ml (0.6 mol) of 2,2-diethoxyacetophenone are slowly added at -78° C. and the mixture is stirred at room temperature overnight. It is then added to water and extracted 3 times with ethyl acetate, dried and concentrated on a rotary evaporator. The purity is sufficient for further reaction. After chromatography, 180.5 g (67%) of the title compound are obtained. M.p.: 133° C.

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