Ethanol → 3′,4′-Dihydro-6′-methoxyspiro[imidazolidine-4,1′(2′H)-naphthalene]-2,5-dione

Participants

Reaction Conditions

Reaction Steps

A mixture of 35.2 g (0.2 mol) of 6-methoxy-1-tetralone, 19.5 g (0.3 mol) of potassium cyanide and 134.4 g (1.4 mol) of ammonium carbonate in 280 mL of EtOH was placed in a stainless steel bomb and heated at 110° C. for 48 hours. After cooling, the mixture was poured in 1.4 L of water. It was allowed to sit at ambient temperature for 3 days. The precipitated solid was filtered and washed several times with water and dried to give 48.1 g of a brown solid: mp 218°-220° C. 1H-NMR (DMSO-d6)d10.75(s, 1H),8.45(s, 1H),6.96(d, 1H),6.79 (d, 1H), 6.70 (s, 1H), 3.72 (s, 3H), 2.73 (t, 2H), 1.70-2.20 (m, 4H).

Provenance & Evidence