To a solution of benzyl 2-(5-(2,3-dichlorophenyl)pyridin-3-yl)cyclopropylcarbamate (94 mg, 0.227 mmol) in DCM (3 ml) was added BBr3 (0.682 ml, 0.682 mmol) at 0° C. This reaction mixture was stirred for 1 h at 0° C. The reaction was quenched by addition of saturated NaHCO3 solution, and the mixture was extracted with AcOEt. The extract was washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The residue was dissolved in pyridine (3.00 ml), and ethanesulfonyl chloride (0.086 ml, 0.910 mmol) was added to the solution. This reaction mixture was stirred at room temperature. After 1 h, saturated NH4Cl solution in water was added. The mixture was extracted with AcOEt. The extract was washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash column (EtOAc/Heptane=0-50%, v/v) gave N-(2-(5-(2,3-dichlorophenyl)pyridin-3-yl)cyclopropyl)ethanesulfonamide (6.2 mg, 0.017 mmol, 7% yield). ESI-MS m/z: 371 [M+1]+. 1H NMR (CDCl3, 400 MHz) 1.31 (t, J=7.2 Hz, 3H), 1.38-1.43 (m, 2H), 2.35-2.38 (m, 1H), 2.86-2.91 (m, 1H), 3.14 (q, J=7.2 Hz, 2H), 7.41 (dd, J=7.6, 2.0 Hz, 1H), 7.47 (t, J=7.6 Hz, 1H), 7.57 (t, J=2.0 Hz, 1H), 7.65 (dd, J=7.6, 2.0 Hz, 1H), 8.46 (d, J=2.4 Hz, 1H), 8.53 (d, J=2.4 Hz, 1H).
