反应详情

A mixture of 3-[3-(3,4-dimethoxyphenyl)-2-propylamino]-1,2-propanediol (14.3 g., 0.053 m.), benzaldehyde (12.7 g., 0.12 m.) and benzoic acid (0.3 g.) in toluene (45 ml.) is refluxed for 3 hours, collecting the water formed in a Dean-Stark trap. After washing with saturated NaHCO3 solution and with H2O (2x), the solvent is distilled under reduced pressure. Excess benzaldehyde is distilled at 100° C. at 0.1 mm. The residue, (II) (16.88 g., 89%) is used without further purification in the next step.

1. temperatureis refluxed for 3 hours
2. customcollecting the water
3. customformed in a Dean-Stark trap
4. washAfter washing with saturated NaHCO3 solution and with H2O (2x)
5. distillationthe solvent is distilled under reduced pressure
6. distillationExcess benzaldehyde is distilled at 100° C. at 0.1 mm
7. customThe residue, (II) (16.88 g., 89%) is used without further purification in the next step