2,6-Lutidine → Acetic acid 2-[3-(3-azido-4-methyl-benzoylamino)-5-methanesulfonylamino-4-methoxy-phenyl]-2-methyl-propyl ester

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Reaction Steps

Oxalyl chloride (0.11 mL, 1.3 mmol) was added to a stirring suspension of 148 mg (0.84 mmol) of 3-azido-4-methyl benzoic acid in 5 mL of 1:1 CH2Cl2/THF followed by 1 drop of 10% DMF in THF. After stirring for 1 h, the now homogeneous mixture was concentrated to provide a dark oil. The acid chloride was dissolved in 5 mL of CH2Cl2 and 185 mg (0.56 mmol) of acetic acid 2-(3-amino-5-methanesulfonylamino-4-methoxy-phenyl)-2-methyl-propyl ester was added along with 0.2 mL (1.7 mmol) of 2,6-lutidine. The mixture was stirred overnight, then was diluted with 10 mL of CH2Cl2, and washed with 1 M NaHSO4 (2×), saturated NaHCO3, and brine. The organic portion was dried with Na2SO4, filtered, and concentrated to provide acetic acid 2-[3-(3-azido-4-methyl-benzoylamino)-5-methanesulfonylamino-4-methoxy-phenyl]-2-methyl-propyl ester (238 mg).

Provenance & Evidence