THE REACTION OF ALLOXAN WITH INDOLE AND FURANES. STRUCTURE OF 5-INDOL-3-YL-5-HYDROXYPYRIMIDINE-2,4,6(1H,3H,5H)-TRIONE

The improved syntheses of 5-(indol-3-yl)-5-hydroxypyrimidine-2,4,6(1H,3H,5H)-trione ( 1) , 5-(5-methylfuran-2-yl)-5-hydroxypyrimidine-2,4,6(1H,3H,5H)-trione ( 2) , 5-(5-N,N-dimethylhydrazonylfuran-2-yl)-5-hydroxypyrimidine-2,4,6(1H,3H,5H)-trione ( 3) , 5-(4-N,N-di-methyl-aminophenyl)-5-hydroxypyrimidine-2,4,6(1H,3H,5H)-trione ( 4a) , and 5-(4-N,N-diethylaminophenyl)-5-hydroxypyrimidine-2,4,6 (1H,3H,5H)-trione ( 4b) from alloxane in mild conditions were reported. The structure of 5-(indol-3-yl)-5-hydroxypyrimidine-2,4,6(1H,3H,5H)-trione ( 1) has been  determined by XRD study.