反应详情

2-p-Morpholinophenylpropargyl alcohol (3C) (8 g) and 4-methyl-1-naphthol (5 g) were dissolved in hot toluene (300 cm3) and the solution added to dry acidic alumina (200 g) in a flask fitted with a condenser. The mixture was heated (20 minutes) on a water bath, cooled and filtered. The residual alumina was extracted with chloroform (3×100 cm3). The combined organic filtrates and extracts were evaporated and the residual oil was purified by chromatography on acidic alumina (100 g) using a 1:20 mixture of dichloromethane and petroleum as eluant. The heliochromic fraction was separated and the solvent removed, leaving a dark brown oil. Two further chromatographic separations failed to improve the quality of the benzochromene (3D; R=Me). The brown oil darkens in air but its n.m.r. spectrum indicates less than 5% impurities.

1. additionthe solution added to dry acidic alumina (200 g) in a flask
2. customfitted with a condenser
3. temperatureThe mixture was heated (20 minutes) on a water bath
4. temperaturecooled
5. filtrationfiltered
6. extractionThe residual alumina was extracted with chloroform (3×100 cm3)
7. customThe combined organic filtrates and extracts were evaporated
8. customthe residual oil was purified by chromatography on acidic alumina (100 g)
9. additiona 1:20 mixture of dichloromethane and petroleum as eluant
10. customThe heliochromic fraction was separated
11. customthe solvent removed
12. customleaving a dark brown oil