A biphasic mixture of 2-(4-amino-phenyl)-1-ethyl-6-methoxy-1H-indole-3-carbonitrile (70 mg, 0.24 mmol), prepared as described in example 1Ga step B, and ethyl chloroformate (0.03 mL, 0.29 mmol) in EtOAc (3 mL) and saturated NaHCO3 (3 mL) was prepared at 0° C. and then allowed to warm to room temperature and stirred for 24 h. The reaction was then diluted with H2O and extracted with EtOAc (2×). The organic phases were washed with H2O and saturated NaCl and then dried and concentrated. Flash chromatography (EtOAc/hexanes 20-40%) gave 48 mg (55%) of [4-(3-cyano-1-ethyl-6-methoxy-1H-indol-2-yl)-phenyl]-carbamic acid ethyl ester as an off-white solid.
