[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([N:9]2[CH:13]=[CH:12][C:11](NCC(OC)=O)=[N:10]2)=[CH:5][CH:4]=1.C(N(CC)CC)C.ClC([O:30][CH2:31][CH:32](C)[CH3:33])=O.[BH4-].[Na+]>O1CCCC1C([O-])=O.O>[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]([N:9]2[CH:13]=[CH:12][C:11](/[CH:33]=[CH:32]/[CH2:31][OH:30])=[N:10]2)=[CH:7][CH:8]=1To a solution of 1-[(4-methoxy)phenyl]-3-[E-2-(carboxy)ethenyl]-1H-pyrazole-5-[(2'-aminosulfonyl-[1,1']-biphen-4-yl)carboxyamide (1.0 g, 1.93 mmol) in 20 mL of tetrahydrofuran at-20° C. was added triethylamine (0.27 mL, 1.93 mmol) and iso-butyl chloroformate (0.25 mL, 1.93 mmol). This mixture was stirred for 30 min and then there was added sodium borohydride (0.22 g, 5.78 mmol) in a minimal amount of water. The reaction mixture was stirred with slow warming to room temperature for 1 h and then was quenched with 10% aq HCl. After diluting with ethyl acetate, the organics were washed with brine, dried (MgSO4) and concentrated in vacuo. The residue was purified by prep HPLC (C18 reverse phase column, elution with a H2O/CH3CN gradient with 0.5% TFA) and lyophilized to afford 0.5 g (52%) of the title compound as a white powder. LRMS (ES+): 504.9 (M+H)+.
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