反应详情

Combine rac-N2-methyl-N2-(1-methyl-pyrrolidin-3-ylmethyl)-benzooxazole-2,5-diamine (0.040 g, 0.154 mmol), 2′,4′-dichloro-biphenyl-4-carboxylic acid (0.062 g, 0.230 mmol), HATU (0.058 g, 0.154 mmol), polystyrene-bound diisopropylamine (0.385 g, loading: 2.0 to 3.5 mmol/g), and CH2Cl2 (10 mL). Shake the mixture overnight at room temperature. Filter the mixture and wash the polystyrene resin with 1:1 CH2Cl2/MeOH. Subject the mixture to flash column chromatography on an ISCO Companion (12 g column, eluting with 10% 2M NH3 in MeOH/CH2Cl2) to yield a colorless oil (0.036 g). Dissolve the oil in CH2Cl2, wash with 1.0M NaOH (3×25 mL), dry over Na2SO4, filter, concentrate in vacuo, and pump overnight on high vacuum to yield the desired product (0.031 g, 40%). mass spectrum (m/e): 509.0 (M+1), 507.0 (M−1). 1H NMR (400 MHz, DMSO-d6) δ 10.28 (s, 1H), 8.03 (d, J=8.8 Hz, 2H), 7.80-7.78 (m, 1H), 7.73-7.71 (m, 1H), 7.61-7.48 (m, 4H), 7.40-7.33 (m, 2H), 3.50 (d, J=8.0 Hz, 1H), 3.13 (s, 3H), 2.65-2.55 (m, 1H), 2.44-2.34 (m, 2H), 2.28-2.21 (m, 1H), 2.23 (s, 3H), 1.93-1.83 (m, 2H), 1.49-1.39 (m, 2H).

1. customthe mixture overnight
2. customat room temperature
3. filtrationFilter the mixture
4. washwash the polystyrene resin with 1:1 CH2Cl2/MeOH
5. washon an ISCO Companion (12 g column, eluting with 10% 2M NH3 in MeOH/CH2Cl2)