A convenient one-pot procedure for the synthesis of 1-substituted and 1,3- disubstituted uracils and 2-thiouracils consists of acylation of ureas, or thioureas with methyl 3,3-dimethoxypropanoate in the presence of a strong base, and acidic work-up. The yields range from 36 to 99%. In all cases, only one regioisomer is isolated.
合成 1-取代和 1,3-二取代尿
嘧啶和 2-
硫尿
嘧啶的简便一步法包括在强碱存在下用
3,3-二甲氧基丙酸甲酯酰化
脲类或
硫脲类化合物,然后进行酸性处理。产率从 36% 到 99%不等。 在所有情况下,只能分离出一种 Regioisomer。