反应详情

温度

-78 °C

To a solution of 3-tert-butyldimethylsilyloxymethyl-9-bromo-6,7-dihydropyrido[3,2-b]thieno[2,3-d]oxepine (0.0500 g, 0.117 mmol;) in tetrahydrofuran (1.78 mL, 22.0 mmol) was added 1.60 M of n-butyllithium in hexane (0.0806 mL) dropwise at −78° C. The reaction mixture was stirred at −78° C. for 1 h. Ethyl chloroformate (0.0336 mL, 0.352 mmol;) was added to the mixture at −78° C. then let stirred 2 h. The reaction mixture was quenched with sat.NaHCO3 then extracted EtOAc (2×). The combined organic layers was dried Na2SO4, concentrated. The crude product was purified by flash chromatography (0-50% EtOAc/Hex) (eluted 15%) to give 3-tert-butyldimethylsilyloxymethyl-9-ethylcarboxy-6,7-dihydropyrido[3,2-b]thieno[2,3-d]oxepine (36% yield). MS: (ESI+) 420.1

1. stirringthen let stirred 2 h
2. customThe reaction mixture was quenched
3. concentrationconcentrated
4. customThe crude product was purified by flash chromatography (0-50% EtOAc/Hex) (eluted 15%)