Piperidine → Ethyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)-2-(3-pyridyl)propenoate

Participants

Reaction Steps

Here, 3,5-di-t-butyl-4-hydroxybenzaldehyde (223 g, 0.952 mol), Ethyl 3-pyridylacetate (157.2 g, 0.952 mol), piperidine (81 g, 0.952 mol) and p-tolunesulfonic acid (0.5 g) are combined in ethanol (2,400 ml) and heated at reflux for 48 hours. The reaction mixture is allowed to cool to room temperature and then stirred on an ice bath, whereupon the product begins to crystallize. The mixture is stored in the freezer overnight, filtered and rinsed with cold ethanol-water (1:1). The product is dried, giving ethyl 3-(3,5-di-t-butyl-4-hydroxyphenyl)-2-(3-pyridyl)propenoate (169.1 g) Mp 119.5°-120.5° C.

Provenance & Evidence