Acetic Acid → HCID 20501032, compound

Participants

Reaction Steps

A mixture of 3-benzyloxycarbonyl-1-ethoxycarbonyl-1'-(3,4-dichlorobenzyl)spiro[imidazolidine-4,3'-indoline]-2,2',5-trione (1.7 g.), 10% w/w palladium on carbon (0.1 g.), acetic acid (0.3 ml.), ethanol (25 ml.) and 1,2-dimethoxyethane (50 ml.) was hydrogenated at atmospheric pressure for 2 hours. The mixture was separated by filtration through diatomaceous earth and the filtrate was evaporated. The residual oil solidified on treatment with a few drops of toluene. The solid obtained was recrystallised from ethyl acetate/petrol 60-80 to give 1-ethoxycarbonyl-1'-(3,4-dichlorobenzyl)-spiro[imidazolidine-4,3'-indoline]-2,2',5-trione (0.7 g.), 176°-179° C.

Provenance & Evidence