Heterocycles from heterocycles. 1,3-Diaryl-4,5-imidazolidinediones from 1,3,5-triarylhexahydro-1,3,5-triazines and oxalyl chloride
作者:Giancarlo Verardo、Angelo G. Giumanini、Fausto Gorassini、Marilena Tolazzi、Paolo Strazzolini
DOI:10.1016/s0040-4020(01)81552-0
日期:1993.1
1,3-Diaryl-4,5-imidazolidinediones ( 6 ) are easily synthesized from 1,3,5-triarylhexahydro-1,3,5-triazines ( 1 ) and oxalyl chloride ( 5 ) in a reaction not likely to involve the zwitterionic intermediate ( 3 ) of the N-methylenearylamine dimer, but viewing the sequential pick up of two units of the monomer ( 2 ) by oxalyl chloride ( 5 ). The essential role of ethyl alcohol added to the reaction mixture is recognized. Reaction conditions have been optimized and some ten imidazolidinediones ( 6 ) were prepared in good to excellent yields. Geometric parameters of 6 were obtained by X-ray diffraction analysis: all the nuclei are found almost in one plane except for a small twist of the phenyl rings about the C-N bond.