Imidazole → 3-(2-{[tert-Butyl(diphenyl)silyl]oxy}ethyl)-1-(2-methoxy-4-nitrophenyl)pyridin-2(1H)-one

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Reaction Steps

24 g (81 mmol) of the compound from Example 30A are dissolved in 200 ml of anhydrous N,N-dimethylformamide, and 7.2 g (106 mmol) of imidazole and 27 g (98 mmol) of tert-butyl(chloro)diphenylsilane are added. After 16 h, the mixture is diluted with 1.2 l of water and extracted three times with ethyl acetate. The combined organic phases are washed twice with water, dried over magnesium sulphate, filtered and concentrated under reduced pressure. For crystallization, tert-butyl methyl ether is added, and the resulting crystals are filtered off and dried under reduced pressure. This gives 30 g (67% of theory) of the desired product.

Provenance & Evidence