反应详情

A solution of cyanoacetic acid (4.3 g., 0.05 mole) in 15 ml. of dioxane was cooled with an ice bath, and 4-hydroxy-4-phenylpiperidine (8.8 g., 0.05 mole) added while maintaining an internal temperature of 20°-25° C. Upon complete addition and a further fifteen minutes of stirring 37% aqueous formaldehyde (9 gm., 0.10 mole) was addded dropwise in approximately five minutes. When approximately half was added carbon dioxide evolution was observed, the maximum internal temperature was 28° C. The reaction mixture was stirred overnight, mixed with 100 ml. of methylene chloride, the organic phase separated, washed with water and salt solution. Upon removal of solvent the product was obtained as an oil, 10.5 g., in practically analytical purity.

1. temperaturewhile maintaining an internal temperature of 20°-25° C
2. additionUpon complete addition
3. customwas 28° C
4. additionmixed with 100 ml
5. customof methylene chloride, the organic phase separated
6. washwashed with water and salt solution
7. customUpon removal of solvent the product
8. customwas obtained as an oil, 10.5 g