Salicylaldehyde → alpha-(2'-Hydroxybenzylidene)-delta-valerolactone

Beteiligte Stoffe

Reaktionsschritte

Salicylaldehyde (15.2 g) and δ-valerolactone (25 g) were dissolved in toluene (150 ml). By the reaction in the same manner as in Example 307, oily α-(2′-hydroxybenzylidene)-δ-valerolactone (7.0 g) was obtained. Dimethylformamide (70 ml) and potassium carbonate (9.5 g) were added hereto and (S) -glycidyl nosylate (8.9 g) was added. The mixture was stirred at 40° C. for 2 hr. The reaction mixture was concentrated under reduced pressure. Water was added and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the oily title compound (7.8 g). The reaction in the same manner as in Example 307 using this product (1.0 g) and 4-(naphthalen-2-yl)piperidine (1.0 g) in methanol (50 ml) was performed and the obtained oil was recrystallized from ethyl acetate to give the title compound (0.38 g), melting point 142-144° C.

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