4-Nitrobenzenesulfonyl chloride → N-{2-[(3S)-4-{[tert-butyl(diphenyl)silyl]oxy}-3-{[(4-nitrophenyl)sulfonyl]amino}butyl]phenyl}-Nalpha-(methoxycarbonyl)-beta-phenyl-L-phenylalaninamide

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Reaction Steps

A solution of N-{2-[(3S)-3-amino-4-{[tert-butyl(diphenyl)silyl]oxy}butyl]phenyl}-Nα-(methoxycarbonyl)-β-phenyl-L-phenylalaninamide (8, 255.1 mg, 0.364 mmol) in pyridine (2 mL) was treated with solid p-nitro benzenesulfonyl chloride (247 mg, 1.115 mmol) (or any other suitable sulfonyl chloride) and the mixture stirred at room temperature for 13 h, quenched with sat. NaHCO3 (0.5 mL), diluted with DCM, washed with sat. NaHCO3 then aqueous 5% KHSO4 then saturated NaHCO3, dried over MgSO4, filtered and concentrated to get 326 mg (100% yield) of the title compound, which was used without further purification for the next step. MS: m/z=885.3 (MH+).

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