Methyl 5-(2-(tert-butoxycarbonylamino)acetamido)-2-hydroxybenzoate → Methyl 5-(2-aminoacetamido)-2-hydroxybenzoate

Beteiligte Stoffe

Reaktionsschritte

The methyl 5-(2-(tert-butoxycarbonylamino)acetamido)-2-hydroxybenzoate (1.3 g, 4.0 mmol) was dissolved in CH2Cl2 (15 mL) and TFA (8 mL). The reaction was stirred (RT, 2.5 h) and then concentrated to afford methyl 5-(2-aminoacetamido)-2-hydroxybenzoate as a clear oil. [M+H]+=225.1. The oil was dissolved in CH2Cl2 (20 mL) and to this was added DHA (1.3 g, 4.0 mmol), EDCI (0.84 g, 4.4 mmol) and triethylamine (2.0 g, 20.0 mmol). The reaction was stirred (RT, 4 h) and then partitioned between CH2Cl2 and brine. The aqueous layer was extracted with CH2Cl2, and the combined organic layers were dried over MgSO4. The crude material was purified by silica chromatography (0-5% MeOH/CH2Cl2) to afford 0.9 g of methyl 5-(2-(4Z,7Z,10Z,13Z,16Z,19Z)-docosa-4,7,10,13,16,19-hexaenamidoacetamido)-2-hydroxybenzoate as a tan solid. Mass calculated for C10H12N2O4=534.69. found: [M+H]+=535.4.

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