THE 4-HALOGENOPHENYLGLYOXALS INTERACTION WITH N-ALKOXY-N’-ARYLUREAS
Keywords:arylglyoxals; N-alkoxy-N’-arylureas; synthesis; 3-alkoxy-5-aryl-4,5-dihydroxy-1-phenylimidazolidin-2-ones; 3-alkoxy-5-aryl-1-phenylimidazolidine-2,4-diones.
Aim. To investigate the 4-X-phenylglyoxal (X = F, Cl, Br) interaction with N-alkoxy-N’-arylureas in acetic acid medium at room temperature. Methods. Mass spectrometry, 1H and 13C NMR spectroscopy. Results. We have showed these reaction type peculiarities and several different tendencies depending on the aryl glyoxal moiety structure. In this article we have described the influence of this moiety at the stage of the hydantoin formation. It has been found that the 4-fluorophenylglyoxal hydrate interacts with N-methoxy-N’-phenylurea in acetic acid during 99 h at 26 °C yielding the mixture of 5-(4-fluorophenyl)-cis-4,5-dihydroxy-3-methoxy-1-phenylimidazolidin-2-one, 5-(4-fluorophenyl)-trans-4,5-dihydroxy-3-methoxy-1-phenylimidazolidin-2-one, and 5-(4-fluorophenyl)-3-methoxy-1-phenylimidazolidine-2,4-dione. The 5-(4-fluorophenyl)-3-methoxy-1-phenylimidazolidine-2,4-dione is yielded because of the additional exposure the products mixture in acetic acid during 260 h. The 4-chlorophenylglyoxal hydrate reacts with N-ethoxy-N’-phenylurea in acetic acid at 26–27 °C during 219 h yielding the mixture of 5-(4-chlorophenyl)-3-ethoxy-cis-4,5-dihydroxy-1-phenylimidazolidin-2-one and 5-(4-chlorophenyl)-3-ethoxy-1-phenylimidazolidine-2,4-dione. After being processed by the p-toluenesulfonic acid this mixture is converted in pure 5-(4-chlorophenyl)-3-ethoxy-1-phenylimidazolidine-2,4-dione. 4-Bromophenylglyoxal hydrate interacts with N-n-butyloxy-N’-phenylurea in acetic acid during 52 h at 26 °C yielding only the mixture of the diastereomers of 5-(4-bromophenyl)-3-n-butyloxy-4,5-dihydroxy-1-phenylimidazolidin-2-one. The molar ratio of 5-(4-bromophenyl)-3-n-butyloxy-cis-4,5-dihydroxy-1-phenylimidazolidin-2-one and 5-(4-bromophenyl)-3-n-butyloxy-trans-4,5-dihydroxy-1-phenylimidazolidin-2-one is 91 : 9. The diastereomers of 5-(4-bromophenyl)-3-n-butyloxy-4,5-dihydroxy-1-phenylimidazolidin-2-one were converted into 5-(4-bromophenyl)-3-n-butyloxy-1-phenylimidazolidine-2,4-dione because of the p-toluenesulfonic acid action. As a conclusion we have proposed the possible mechanism of 3-alkoxy-5-aryl-4,5-dihydroxy-1-phenylimidazolidin-2-ones conversion into 3-alkoxy-5-aryl-1-phenylhydantoins. Conclusions. It has been found that the 4-halogenophenylglyoxal interaction with N-alkoxy-N’-phenylureas in acetic acid at room temperature under the further processing by of p-toluenesulfonic acid is new way to synthetize 3-alkoxy-5-(4-halohenophenyl)-1-phenylhydantoins. It has been shown that there is a certain tendency depending on the 4-halogenophenyl substituent nature of the influence on the reaction.
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