Sodium Bicarbonate → Biphenyl-2-ylcarbamic Acid 1-(2-{[3-(4-{[(R)-2-(tert-Butyldimethylsilanyloxy)-2-(8-hydroxy-2-oxo-1,2-dihydroquinolin-5-yl)ethylamino]-methyl}phenylcarbamoyl)phenyl]methylcarbamoyl}ethyl)piperidin-4-yl Ester

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A solution of biphenyl-2-ylcarbamic acid 1-(2-{[3-(4-formylphenylcarbamoyl)phenyl]methylcarbamoyl}ethyl)piperidin-4-yl ester (151 mg, 0.250 mmol) and 5-[(R)-2-amino-1-(tert-butyldimethylsilanyloxy)ethyl]-8-hydroxy-1H-quinolin-2-one acetic acid salt (98.6 mg, 0.250 mmol) in 1:1 MeOH:DCM (2.0 mL) was stirred at room temperature for 3 h. Sodium triacetoxyborohydride (159 mg, 0.750 mmol) was added and the reaction mixture was stirred at room temperature for 3 h. LC-MS (Method 10-90) showed product was present (Rt 3.32 min; m/z 923.6 [M+H]+. Saturated aqueous sodium bicarbonate solution was added and the layers were separated. The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure to give the title compound, which was used in the next reaction without further purification.

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