Sodium hydride → HCID 13324710, compound

Participants

Reaction Steps

A slurry of 2.64 g (0.11 mole, 1.1 equivalents) sodium hydride in 15.36 g (0.1 mole) 5-chloroindoline and 50 ml sieve dried DMSO was permitted to stir at room temperature under nitrogen for 2 hours. While cooling in an ice bath, a solution of 12.11 g (0.1 mole) 3-fluorobenzonitrile in 15 ml sieve dried DMSO was then added dropwise over 15 minutes. AT the end of the addition, the ice bath was removed and the reaction mixture was permitted to warm to room temperature and stir overnight (20 hours). The product was poured onto ice and then extracted twice with CHCl3. The combined organic portions (400 ml) were washed four times with water (400 ml portions), 4N HCl (three 300 ml portions) brine (300 ml), dried over Na2SO4, and concentrated to give 28.03 g (25.47 g theory) of a solid. Recrystallization from hot absolute ethanol containing 5-10% CHCl3 afforded 11.12 g (43.66% overall) of 3-(5-chloro-1-indolinyl)benzonitrile, m.p. 120°-121° C.

Provenance & Evidence