Diisopropylethylamine → 1-[2-(Chroman-3-yl)ethyl]-1,2,5,6-tetrahydropyridine-3-carboxylic acid ethyl ester

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Reaction Steps

First 2.1 g (11 mmol) of 1,2,5,6-tetrahydropyridine-3-carboxylic acid ethyl ester hydrochloride and then 4.53 g (35 mmol) of N-ethyl-N,N-diisopropylamine are added to a solution of 3.32 g (10 mmol) of 3-[2-(p-toluenesulphonyloxy)ethyl]-chroman in 50 ml of absolute dimethylformamide. The mixture is stirred for 16 hours at 60° and, after cooling, is concentrated by evaporation under a high vacuum. Water is added to the oily residue and extraction is carried out with diethyl ether. The combined organic phases are extracted with 2N hydrochloric acid. The combined hydrochloric acid extracts are rendered alkaline, while cold, with sodium hydroxide solution (30% strength) and extracted with dichloromethane. The combined dichloromethane phases are dried over sodium sulphate and concentrated by evaporation in vacuo. 1.65 g (52.3%) of 1-[2-(chroman-3-yl)ethyl]-1,2,5,6-tetrahydropyridine-3-carboxylic acid ethyl ester are obtained in the form of a yellow oil. The 1-[2-(chroman-3-yl)ethyl]-1,2,5,6-tetrahydropyridine-3-carboxylic acid ethyl ester hydrochloride produced therefrom using hydrochloric acid in diethyl ether crystallises from acetone/diethyl ether and melts at 177°-178°.

Provenance & Evidence