تفاعل #9923

معادلة التفاعل

3-amino-3-(3-ethoxy-4-methoxyphenyl)propanoic acid

4-methylphthalic anhydride

ethyl acetate

hexane

→

3-(3-ethoxy-4-methoxyphenyl)-3-(4-methylphthalimido)propanoic acid

المردود 71.0%

المذيبات

acetic acid

water

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةto reflux under nitrogen for 18 hours
2. 2
   أخرىThe solvent was removed in vacuo
3. 3
   أخرىto give an oil
4. 4
   ترشيحThe resulting suspension was filtered
5. 5
   غسيلThe solid was washed with water (3×10 mL) and hexane (3×10 mL)
6. 6
   أخرىwas dried in a vacuum oven overnight (60 ° C., <1 torr)

الإجراء التجريبي

A stirred solution of 3-amino-3-(3-ethoxy-4-methoxyphenyl)propanoic acid (3.00 g, 12.5 mmol) and 4-methylphthalic anhydride (2.13 g, 12.5 mmol, 95%) in acetic acid was heated to reflux under nitrogen for 18 hours. The mixture was allowed to cool to room temperature. The solvent was removed in vacuo to give an oil. The resulting oil was stirred with ethyl acetate (10 mL), hexane (10 mL) and water (30 mL) for 30 minutes. The resulting suspension was filtered. The solid was washed with water (3×10 mL) and hexane (3×10 mL), and then was dried in a vacuum oven overnight (60 ° C., <1 torr) to give 3-(3-ethoxy-4-methoxyphenyl)-3-(4-methylphthalimido)propanoic acid as a white solid (3.4 g, 71% yield): mp, 134.0–136.0° C.; 1H NMR (DMSO-d6) δ 1.31 (t, J=6.9 Hz, 3H, CH3), 2.47 (s, 3H, CH3), 3.23 (dd, J=6.7, 16.5 Hz, 1H, CHH), 3.50 (dd, J=9.2, 16.5 Hz, 1H, CHH), 3.72 (s, 3H, CH3), 3.97 (q, J=6.9 Hz, 2H, CH2), 5.58 (dd, J=6.7, 9.1 Hz, 1H, NCH), 6.90–6.95 (m, 2H, Ar), 7.01 (br s, 1H, Ar), 7.61–7.76 (m, 3H, Ar), 12.4 (br s, 1H, OH); 13C NMR (DMSO-d6) δ 14.65, 21.32, 36.09, 50.04, 55.45, 63.72, 111.79, 112.15, 119.29, 123.08, 123.58, 128.51, 131.35, 131.49, 134.95, 145.63, 147.75, 148.53, 167.67, 167.78, 171.72; Anal Calcd for C21H21NO6: C, 65.79; H, 5.52; N, 3.65. Found: C, 65.46; H, 5.57; N, 3.31.

المصدر