反应详情

A solution of 4-morpholino-2-naphthol (1.5 g, 6.5 mmol) and 1(4-morpholinophenyl)-1-phenylprop-2-yn-1-ol (1.92 g, 6.5 mmol) in toluene (65 cm3) containing acidic alumina (Brockmann 1), (4.0 g) was refluxed for 60 minutes. The cooled solution was filtered and the alumina was washed well with EtOAc (200 cm3). Removal of the solvent from the filtrate gave an oil which solidified on standing at room temperature. Recrystallisation from EtOAc/hexane gave 6-morpholino-3(4-morpholinophenyl)-3-phenyl-3H-naphtho[2,1-b]pyran (yield=2.4 g, theoretical yield=3.3 g 73%, m.p.=187-188° C. (uncorrected), λmax in toluene=469 nm, i.e. red-orange).

1. temperaturewas refluxed for 60 minutes
2. filtrationThe cooled solution was filtered
3. washthe alumina was washed well with EtOAc (200 cm3)
4. customRemoval of the solvent from the filtrate
5. customgave an oil which
6. customon standing at room temperature
7. customRecrystallisation from EtOAc/hexane