Chlorotrimethylsilane → tert-Butyl 4-((trimethylsilyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate

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Reaction Conditions

Reaction Steps

4-Oxo-piperidine-1-carboxylic acid tert-butyl ester (10.0 g, 501 mmol) was dissolved in DMF (20 mL). Chlorotrimethylsilane (6.6 g, 60.6 mmol) was added, followed by Et3N (12.3 g, 122 mmol). The mixture was stirred at 80° C. for 16 hours, cooled to ambient temperature, diluted with Et2O, and then washed with water, followed by brine. The organic layer was separated, dried over Na2SO4, filtered and concentrated. Purification by flash chromatography on silica gel (EtOAc/heptanes 0-50%) afforded 4-trimethylsilanyloxy-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (4.3 g, 32% yield). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 4.80 (br. s., 1H), 3.88 (br. s., 2H), 3.53 (t, J=5.81 Hz, 2H), 2.11 (br. s., 2H), 1.49 (s, 9H), 0.20 (s, 9H).

Provenance & Evidence