Improved One-Step Procedure for the Preparation of 1-Substituted and 1,3-Disubstituted Uracils and 2-Thiouracils
作者:Ib Winckelmann、Erik H. Larsen
DOI:10.1055/s-1986-31867
日期:——
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。