1-Bromo-2,3-dichlorobenzene → 1-(2,3-Dichlorophenyl)-[1,4]diazepine

Participants

Reaction Steps

2.25 g (10 mmol) 1-bromo-2,3-dichloro-benzene was dissolved in dry toluene (50 ml), 2.3 (11 mmol) of [1,4]diazepine-1-carboxylic acid tert-butylester was added followed by 0.2 g BINAP (2,2-bis(diphenylphosphino)-1,1′-binaphtyl), 85 mg tris(dibenzylideneacetone)dipalladium(0) and 1.2 g (12 mmol) sodium-tert-butoxyde. The reaction mixture was refluxed for eight hours and filtered. The organic layer was washed with water, dried and evaporated in vacuo. The residue was purified by chromatography and deprotected at 10° C. using 20 ml ethylacetate saturated with gaseous hydrochloric acid, the precipitate was filtered giving 2.1 g (yield: 75%) hydrochloride salt of the title compound, melting at 182-3° C.

Provenance & Evidence