反应详情

Prepared using General Procedure 5: To a solution of 4-(heptyloxy)benzoic acid (400.0 mg, 1.54 mmol) in anhydrous DMF (6 mL) were added HOBt (312.3 mg, 2.31 mmol) and EDC (442.75 mg, 2.31 mmol). After stirring for 2 h, (S,Z)-methyl 2-(4-(tert-butyl)benzamido)-3-(4-(N-hydroxycarbamimidoyl)phenyl)-propanoate, INT-2 (673.3 mg, 1.69 mmol) was added. The reaction mixture was stirred at RT for 2 h, partitioned between saturated aqueous NaHCO3 (15 mL) and EA (15 mL), and concentrated under reduced pressure to afford the intermediate (S)-methyl 2-(4-(tert-butyl)benzamido)-3-(4-(N-((4-(heptyloxy)benzoyl)oxy) carbamimidoyl)phenyl)propanoate. The intermediate was dissolved in DMF (10 mL) and heated to 100° C. for 18 h. The reaction mixture was cooled to RT and partitioned between EA (10 mL) and saturated aqueous NaHCO3 (50 mL). The organic layer was extracted with water (2×10 mL) and brine (10 mL). The organic layer was dried over MgSO4 and concentrated. The brown oil was purified by chromatography (EA/hexanes) to afford 710 mg (77%) of (S)-methyl 2-(4-(tert-butyl)benzamido)-3-(4-(5-(4-(heptyloxy)phenyl)-1,2,4-oxadiazol-3-yl)phenyl)-propanoate as a white solid. LCMS-ESI (m/z) calculated for C36H43N3O5: 597.3; no m/z observed, tR=12.80 min (Method 2). 1H NMR (400 MHz, DMSO) δ 8.84 (d, J=8.0 Hz, 1H), 8.08 (t, J=17.2 Hz, 2H), 7.97 (dd, J=18.2, 8.5 Hz, 2H), 7.74 (d, J=8.5 Hz, 2H), 7.50 (dd, J=18.6, 8.3 Hz, 4H), 7.18 (d, J=8.9 Hz, 2H), 4.85-4.63 (m, 1H), 4.09 (dd, J=13.8, 7.3 Hz, 2H), 3.67 (s, 3H), 3.24 (ddd, J=23.8, 15.7, 7.3 Hz, 4H), 2.08 (s, 4H), 1.74 (dd, J=14.1, 6.9 Hz, 2H), 1.42 (dd, J=13.6, 6.3 Hz, 2H), 1.30 (d, J=14.5 Hz, 9H), 0.88 (t, J=6.8 Hz, 3H). 13C NMR (101 MHz, DMSO) δ 174.05, 170.87, 133.81, 165.14, 161.43, 153.21, 140.51, 129.70, 128.85, 128.78, 126.06, 125.84, 123.93, 123.39, 114.36, 114.25, 66.86, 52.66, 50.88, 34.32, 33.47, 30.06, 29.74, 27.33, 27.24, 24.23, 20.89, 12.80.

1. customPrepared
2. stirringThe reaction mixture was stirred at RT for 2 h
3. custompartitioned between saturated aqueous NaHCO3 (15 mL) and EA (15 mL)
4. concentrationconcentrated under reduced pressure