Water → 3-Benzoylpyrrole

Participants

Reaction Steps

To a stirred suspension of sodium hydride (8.0 g) in 200 ml of dry ethyl ether was added dropwise a solution of phenylvinylketone (13.22 g) and tosylmethyl isocyanide (19.52) in 150 ml of dry methyl sulfoxide and 300 ml of dry ethyl ether at such a rate that the ether refluxed gently. After complete addition, the suspension was stirred at room temperature for 30 minutes and subsequently hydrolyzed by dropwise addition of 200 ml of water. The ether layer was separated and the aqueous layer extracted with ethyl acetate. The combined organic layers were washed with water, 0. 1N sulfuric acid, and again with water. The organic phase was dried over magnesium sulfate, filtered and evaporated in vacuo. The residue was purified by flash column chromatography (silica gel, DCM/ethyl acetate, 5:1). The desired fractions were concentrated and the residual oil was crystallized from DCM/hexane, affording the product as crystals (7.11 g), m.p. 98°-99° C. (lit* m.p. 6°-97° C.).

Provenance & Evidence