反应详情

To a solution of N-hydroxybenzenecarboximidoyl chloride (Tetrahedron Letters, 47(9), 1457-1460, 2006, 500 mg, 3.21 mmol) and cyclopropyl-propynoic acid ethyl ester (Organic Syntheses, 66, 173-179, 1988, 515 mg, 3.21 mmol) in diethyl ether (5 ml) was added dropwise over a period of 2 min at ambient temperature triethylamine (0.54 ml, 3.86 mmol) and the reaction mixture was stirred for 3 d at this temperature. The resulting suspension was diluted with tert-butylmethylether (5 ml) and water (10 ml). The aqueous layer was extracted with tert-butylmethylether (10 ml) and the organic layers were washed with water (10 ml) and brine (10 ml). Drying over sodium sulfate and purification by chromatography (SiO2, heptane:ethyl acetate=98:2 to 80:20) afforded the title compound (414 mg, 50%) as a colorless liquid. MS: m/e=258.1 [M+H]+.

1. extractionThe aqueous layer was extracted with tert-butylmethylether (10 ml)
2. washthe organic layers were washed with water (10 ml) and brine (10 ml)
3. dry with materialDrying over sodium sulfate and purification by chromatography (SiO2, heptane:ethyl acetate=98:2 to 80:20)