Sodium bis(trimethylsilyl)amide → 1,1-Dimethylethyl 4-(4-ethenyl-2-thiazolyl)-1-piperidinecarboxylate

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To a cold (−50° C.) suspension of methyltriphenylphosphonium bromide (1.2 g, 3.3 mmol) in tetrahydrofuran (5 mL) was added a solution of sodium bis(trimethylsilyl)-amide (3.4 mL, 3.4 mmol), and the resulting mixture was stirred for 1 h at room temperature. The resulting cloudy yellow solution was re-cooled to −30° C., and 1,1-dimethylethyl 4-(4-formyl-2-thiazolyl)-1-piperidinecarboxylate (0.5 g, 1.68 mmol) was added. The resulting slightly yellow solution was stirred at room temperature for 3 h, then diluted with water, and extracted with ethyl acetate. The organic layer was washed with brine, dried (MgSO4), filtered, and purified by column chromatography on silica gel using 15-30% ethyl acetate in hexanes as eluant to give 471 mg of the title compound as a colorless oil.

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