Boron tribromide → HCID 69706140, compound

Participants

Reaction Conditions

Reaction Steps

A solution of [3′-(5-carbamimidoyl-2-methylsulfanyl-thiophene-3-sulfonyl)-4-methoxy-6-methyl-biphenyl-2-ylmethoxy]-acetic acid ((Example 192: step g) 0.077 g, 0.0148 mmol) in dry CH2Cl2 (10 mL) was cooled to 0° C. and treated with BBr3 (0.592 mL, 0.592 mmol) dropwise. The reaction stirred at 0° C. for 30 min. then was allowed to warm to room temperature and stir 27 h. The reaction mixture was cooled to 0° C. and quenched with MeOH. Some HBr evolution was seen. All solvents were evaporated in vacuo, and the residue was taken up in EtOAc (100 mL) and washed with water (1×75 mL) and brine (2×50 mL). The organic layer was dried over MgSO4 and concentrated in vacuo. Preparatory HPLC (5–50% acetonitrile in 1% TFA/water over 30 min.) afforded the product [3′-(5-carbamimidoyl-2-methylsulfanyl-thiophene-3-sulfonyl)-4-hydroxy-6-methyl-biphenyl-2-ylmethoxy]-acetic acid trifloroacetate (0.039, 52%) as a white glassy solid. 1H NMR (MeOD): δ 8.344 (s, 1H), 8.090 (d, 1H, J=8.0 Hz), 7.877 (t, 1H, J=2.0 Hz), 7.721 (t, 1H, J=7.6 Hz), 7.572 (d, 1H, J=7.6 Hz), 6.778 (d, 1H, J=2.8 Hz), 6.735 (d, 1H, J=2.0 Hz), 2.710 (s, 3H), 2.028 (s, 2H), 1.935 (s, 3H), 1.254 (t, 2H, J=7.6 Hz).

Provenance & Evidence