反应详情

2-Methoxy-3-bromothiophene is reacted with n-butyl lithium in ether at 0° to 5° C., following the method of Sornay et al. [Bull. soc. chim. Fr. (3), p. 999 (1971)]. The organolithium reagent is cooled to -10° to -20° C. and reacted with an equivalent of alloxan in tetrahydrofuran. The reaction mixture is allowed to warm to room temperature and 5-hydroxy-5-(2-methoxy-3-furyl)-2,4,6(1H,3H,5H)pyrimidinetrione isolated according to the method of Example 5.