反应详情

4-Nitrophenyl chloroformate (99.2 mg, 0.49 mmol) was added to a solution of {2-amino-3′-[5-(tert-butoxycarbonylamino-imino-methyl)-2-methylsulfanyl-thiophene-3-sulfonyl]-6-methyl-biphenyl-4-yl}-carbamic acid 2-trimethylsilanyl-ethyl ester (303 mg, 0.45 mmol, Example 294: step f) and pyridine (39.8 μL, 0.49 mmol) in methylene chloride (5 mL) at rt. The reaction mixture was stirred for 2 hrs at rt. 4-(5-Amino-pentyloxy)-benzoic acid methyl ester (117 mg, 0.49 mmol, Example 283: step b) and triethylamine were added to the reaction mixture and stirred for 2 hrs at rt. The reaction mixture was diluted in EtOAc, washed with water and brine, and dried over magnesium sulfate. Removal of solvents in vacuo was followed by flash chromatography (50–60% EtOAc/hexanes) to afford the title compound as a yellow solid (280 mg, 66.5%). ESI-MS (m/z): Calcd. for C44H57N5O10S3Si: 940.3 (M+1); found: 939.9.

1. stirringstirred for 2 hrs at rt
2. washwashed with water and brine
3. dry with materialdried over magnesium sulfate
4. customRemoval of solvents in vacuo