Potassium Iodide → N-[4-bromo-3-(1-ethoxycarbonylbutyloxy)phenyl]-3,4,5,6-tetrahydrophthalimide

Participants

Reaction Steps

A mixture of 15.0 g. of N-(4-bromo-3-hydroxyphenyl)-3,4,5,6-tetrahydrophthalimide, 12.0 g. of ethyl α-bromovalerate, 7.7 g. of potassium carbonate, 2.5 g. of potassium iodide and 50 ml. of acetone was refluxed with stirring for 3 hours and then, the reaction mixture was cooled to room temperature and the salt was separated by a filtration. The filtrate was concentrated under a reduced pressure and 2N-HCl was added to the residue to crystallize the product. The crystal was separated by a filtration and washed with water and dried. The residue was purified by a chromatography on a column of silica gel (developing solvent: ethyl acetate: n-hexane of 1:3) to obtain 17.6 g. of Compound No. 90 shown in table 1.

Provenance & Evidence