Study on Oxazolopyrimidines. VI. Formation of 3-Substituted Xanthines<i>via</i>7(6<i>H</i>)-Iminooxazolopyrimidines
作者:Yozo Ohtsuka
DOI:10.1246/bcsj.46.506
日期:1973.2
The condensation of several primary amines with 4-cyano-5-dialkoxymethylenaminooxazole gave 6-substituted 5-alkoxy-7(6H)-immooxazolo[5,4-d]pyrimidines. These compounds were converted into 3-substituted xanthines by treatment with aqueous alkali or by heating in formamide. The present reaction was compared with an analogous reaction, formation of 9-substituted hypoxantines via 7-aminooxazolo[5,4-d]pyridimine
Study on Oxazolopyrimidines. I. Synthesis and Spectroscopic Properties of 7-Aminooxazolo[5,4-<i>d</i>]pyrimidines
作者:Yozo Ohtsuka
DOI:10.1246/bcsj.43.187
日期:1970.1
Several 2- and 5-substituted oxazolo[5,4-d]pyrimidines have been prepared from 5-amino-4-cyanooxazole derivatives via N-ethoxymethylene intermediates in order to compare them with purine derivatives. Spectroscopic data and some chemical properties of these compounds were examined. A convenient method for the preparation of a starting material was described.