反应详情

To a stirred solution of diisopropylamine (5.2 mL, 37 mmol) in tetrahydrofuran (15 mL) was added dropwise n-butyllithium (1.6 M in hexane, 21 mL, 34 mmol) at 0° C. and stirred for 20 min. A mixture of methyl tetrahydro-2H-pyran-4-carboxylate (4.5 g, 31 mmol) and trimethylsilyl chloride (4.3 mL, 34 mmol) was added to the mixture at −40° C., then trimethylsilyl chloride (0.4 mL, 0.3 mmol) was added to the mixture. The mixture was stirred at room temperature for 2 h. The volatile components were removed by evaporation and the residual mixture was filtered through a pad of celite washing with hexane. The filtrate was evaporated to give 6.9 g (quant.) of the title compound as a clear yellow oil.

1. additionwas added to the mixture at −40° C.
2. stirringThe mixture was stirred at room temperature for 2 h
3. customThe volatile components were removed by evaporation
4. filtrationthe residual mixture was filtered through a pad of celite
5. washwashing with hexane
6. customThe filtrate was evaporated