Diisopropylethylamine → HCID 10110214, compound

Participants

Reaction Steps

A suspension of 3′-methyl-[1,1′-biphenyl]-4-carboxylic acid of Step B (0.50 g, 2.36 mmol) in thionyl chloride (3 mL) was heated at reflux for 30 minutes. After cooling, the thionyl chloride was removed in vacuo. The residue was dissolved in toluene and concentrated in vacuo to give the crude acid chloride as a yellow oil. The acid chloride was then dissolved in dichloromethane (5 mL) and slowly added to a solution of the 10,11-dihydro-5H-pyrrolo [2,1-c][1,4]benzodiazepine (0.65 g, 3.53 mmol) and N,N-diisopropylethyl amine (0.90 mL, 5.17 mmol) in dichloromethane (15 mL). After stirring for 2 hours, the reaction was quenched with water. The organic layer was washed with 1 N hydrochloric acid, 1 N sodium hydroxide and brine, dried over anhydrous sodium sulfate, and concentrated in vacuo to give a white foam. Purification of the residue by flash chromatography using a solvent gradient from 15% to 25% of ethyl acetate in hexane gave a white foam which was crystallized by sonication from ethyl acetate/hexane to provide the title compound (0.74 g, 82.8%) as a white solid, m.p. 128-130° C.

Provenance & Evidence