Pyridine → Tert-butyl 3-(n-{(1r)-1-[(4-chlorophenyl)methyl]-2-[4-(2-{[(2-cyanophenyl)sulfonyl]amino}phenyl)piperidyl]-2-oxoethyl}carbamoyl)(3s)-1,2,3,4-tetrahydroisoquinoline-2-carboxylate

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Reaction Steps

To a 50 mL round-bottomed flask equipped with stirring was added tert-butyl 3-(N-{(1R)-2-[4-(2-aminophenyl)piperidyl]-1-[(4-chlorophenyl)methyl]-2-oxoethyl}carbamoyl)(3S)-1,2,3,4-tetrahydroisoquinoline-2-carboxylate (Example 20) (154 mg, 0.25 mmol), 1,2-dichloroethane (10 mL) and pyridine (0.03 mL, 0.3/5 mmol). The reaction mixture was stirred for 5 min at RT, treated with 2-cyanobenzenesulfonyl chloride (Lancaster Synthesis) (50 mg, 0.25 mmol) and stirred at RT for 16 h. The reaction was quenched with satd NH4Cl (10 mL), the organic layer separated, and the aqueous layer extracted with CH2Cl2 (2×10 mL). The organic fractions were combined, washed with satd NaCl (10 mL), dried over Na2SO4, filtered and concentrated in vacuo. Purification by silica gel chromatography (100% EtOAc) provided the title compound as a white foam (167 mg). MS (ESI, pos. ion) m/z: 782 (M+1); MS (ESI, neg. ion) m/z: 780 (M−1). Calc'd for C42H44ClN5O6S: 781.27.

Provenance & Evidence