Dichloromethane → 2,3-dichloro-N-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]benzenesulfonamide

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Reaction Steps

The title compound was prepared by adding 2,3-dichloro-benzenesulfonyl chloride (11.2 g) and 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenylamine (10.0 g) to a reaction vessel containing a magnetic stirring bar, followed by 200 ml dry DCM and 4.1 ml pyridine. The reaction mixture was stirred at RT for 20 h before being cooled on an ice-bath and quenched with 1M aqueous sodium hydroxide solution. The organic phase was separated and the aqueous phase acidified with 2M aqueous hydrochloric acid and extracted three times with EtOAc. The combined organic phases were washed with brine and dried over sodium sulfate and evaporated to afford the crude product. Purification by flash chromatography on silica gel using a mixture of EtOAc and heptane as the eluent afforded 2,3-dichloro-N-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-benzenesulfonamide as a colorless solid after evaporation of the solvents under reduced pressure. Yield: 15.11 g (77%).

Provenance & Evidence