Trifluoroacetic acid → 2-(N-(4-((4-(heptyloxy)benzoyl)oxy)benzyl)-4-(2-(3-methoxy-4-methylphenyl)acetamido)benzamido)acetic acid

Participants

Reaction Conditions

Reaction Steps

Prepared using General Procedures 6 and 8: To 2-(3-methoxy-4-methylphenyl)acetic acid (14.1 mg, 0.08 mmol) were added HOBT (12.0 mg, 0.08 mmol) in DMF (0.1 mL) and EDC (15.0 mg, 0.08 mmol) in DMF (0.1 mL). After stirring at room temperature for 30 min, 4-((4-amino-N-(2-(tert-butoxy)-2-oxoethyl)benzamido)methyl)phenyl 4-(heptyloxy)benzoate INT-4 (30 mg, 0.05 mmol) and TEA (0.019 mL, 0.10 mmol) in DMF (0.3 mL) were added. The reaction was stirred for 18 h then purified by preparative HPLC to provide 4-((N-(2-(tert-butoxy)-2-oxoethyl)-4-(2-(3-methoxy-4-methylphenyl)acetamido)benzamido)methyl)phenyl 4-(heptyloxy)benzoate. To 4-((N-(2-(tert-butoxy)-2-oxoethyl)-4-(2-(3-methoxy-4-methylphenyl)acetamido)benzamido)methyl)phenyl 4-(heptyloxy)benzoate in DCM (1.0 mL) was added TFA (0.2 mL). The reaction was stirred at 30° C. for 6 h. The reaction was concentrated to afford 22.3 mg (65%) of 2-(N-(4-((4-(heptyloxy)benzoyl)oxy)benzyl)-4-(2-(3-methoxy-4-methylphenyl)acetamido)benzamido)acetic acid 4. LCMS-ESI (m/z) calculated for C40H44N2O8: 680; no m/z observed, tR=11.45 min (Method 2). 1H NMR (400 MHz, DMSO) δ 10.32 (s, 1H), 8.06 (d, J=8.8 Hz, 2H), 7.64 (d, J=8.4 Hz, 2H), 7.43 (d, J=7.2 Hz, 1H), 7.40-7.28 (m, 3H), 7.24 (d, J=8.5 Hz, 2H), 7.17-7.02 (m, 3H), 6.91 (s, 1H), 6.79 (d, J=7.5 Hz, 1H), 4.62 (d, J=36.2 Hz, 2H), 4.08 (t, J=6.5 Hz, 2H), 3.95 (d, J=28.6 Hz, 2H), 3.77 (s, 3H), 3.60 (s, 2H), 2.10 (s, 3H), 1.74 (dd, J=9.8, 4.8 Hz, 2H), 1.48-1.24 (m, 8H), 0.86 (d, J=7.0 Hz, 3H).

Provenance & Evidence