Water → HCID 20313828, compound

Participants

Reaction Steps

Sodium hydride (57% dispersion in mineral oil; 408 mg) is slurried in 10 ml of anhydrous 1,2-dimethoxyethane and treated dropwise with N-(1,3-benzodithiol-2-ylidene)-1H-indol-3-ethanamine (3g, prepared as described in Example 30) in 15 ml of anhydrous 1,2-dimethoxyethane. The reaction mixture is heated at reflux for 2 hours. A solution of p-chlorobenzoyl chloride (1.69g) in 10 ml of anhydrous 1,2-dimethoxyethane is added dropwise to the refluxing mixture. Refluxing is continued for an additional 4 hours. The reaction mixture is then poured into water (100 ml) and extracted with three 50 ml portions of dichloromethane. The combined dichloromethane extracts are washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue is chromatographed on silica gel (500 ml) eluting with dichloromethane/pentane (3:2). The fractions containing product with Rf =0.5 (silica gel; dichloromethane) are concentrated in vacuo. The solid thus obtained is recrystallized from hexane/dichloromethane to yield 2.1g of the title compound, melting point 135° C.

Provenance & Evidence