Author:
Clark-Lewis JW,Moody K,Thompson MJ
Abstract
The betaine formed from 2-dimethylaminoaniline and alloxan
is shown to be 5-(3-methyl-1-benzimidazolio)-4-barbiturate
by synthesis from 1-methylbenzimidazole; it's
N,S-dimethyl derivative (1,3-dimethylbarbiturate) was
also synthesized. A number of analogous betaines was
prepared from alloxan and 1-o-aminophenyl
derivatives of secondary amines, and it was shown by tracer studies that
enamines are not intermediates in
the reaction. A probable mechanism is discussed. 2-Amino-N-mesityl-N-methylaniline and the N-ethyl analogue gave tetrahydroquinoxaline-spirohexahydrotrioxopyrimidines with alloxan instead of betaines, and
alkaline hydrolysis led to the related 4-mesityltetrahydroquinoxalinohydantoins.
Some of the betaines, and one of the spirans, were also obtained by oxidation of uramils. Mass spectra of the betaines are discussed, and N.M.R. data are reported. Ring
expansion occurs during conversion of 5-(3-methyl-1-benzimidazolio)-4-barbiturate
into the related tetrahydroquinoxalinespirobarbituric
acid by reduction with sodium borohydride.
Cited by
18 articles.
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