Ethanol → N-(3,4-Dimethyl-5-isoxazolyl)-N-[(2-methoxyethoxy)methyl]-4'-(2-oxazolyl)-2'-(2-oxazolylmethyl)[1,1'-biphenyl]-2-sulfonamide

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-borono-N-(3,4-dimethyl-5-isoxazolyl)-N-[(2-methoxyethoxy)methyl]-benzenesulfonamide (472 mg, 1.3 mmol, prepared as described in Step (B) of Example 1), the title compound of Step (D) of this Example (250 mg, 0.82 mmol) in 8 ml of toluene and 6.4 ml of 95% EtOH under argon, tetrakis(triphenylphosphine)palladium(0) (95 mg, 0.082 mmol) was added and followed by 4.8 ml of 2M aq. sodium carbonate. The reaction mixture was heated at 75° C. for 4 hrs, cooled and diluted with 50 ml of EtOAc. The organic liquid was separated and washed with 10 ml H2O and 10 ml brine, dried and concentrated. The residue was chromatographed on silica gel using 1:2 hexane/EtOAc to afford the title compound of this step (47 mg, 10%) as a colorless gum. Rf=0.17, silica gel, 1:2 Hexane/EtOAc.

Provenance & Evidence