3-Chloro-4,7-difluorobenzo[b]thiophene-2-carbonyl chloride → {4-[(3-Chloro-4,7-difluorobenzothiophene-2-carbonyl)-(2-methoxy-5-pyridin-4-ylbenzyl)amino]cyclohexyl}methylcarbamic acid tert-butyl ester

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Reaction Steps

To a 3 L 3-neck RB flask equipped with a mechanical stirrer, N2 inlet and addition funnel is added [4-(2-methoxy-5-pyridin-4-yl-benzylamino)cyclohexyl]methylcarbamic acid t-butyl ester P5 (50.3 g, 118.20 mmol) and CH2Cl2 (750 mL). The resulting mixture is cooled in an ice bath and 3-chloro-4,7-difluorobenzothiophene-2-carbonyl chloride P10 (34.7 g, 129.92 mmol) in CH2Cl2 (250 mL) is added over 4 h. The reaction mixture is diluted with CH2Cl2 and washed with 1N HCl (800 mL), 1N NaOH (800 mL), H2O (500 mL) and brine (500 mL). The organic layer is dried over anhydrous Na2SO4 and concentrated in vacuo to an orange-brown solid. The crude product is ground to a fine solid, diluted with EtOAc (450 mL) and the resulting slurry is stirred for 1 h. The mixture is filtered and the filter cake is washed with EtOAc (100 mL), and dried to give {4-[(3-chloro-4,7-difluorobenzothiophene-2-carbonyl)-(2-methoxy-5-pyridin-4-ylbenzyl)amino]cyclohexyl}methylcarbamic acid tert-butyl ester P6 (66.0 g, 85%) as an off-white solid.

Provenance & Evidence