An efficient substituent dependent synthesis of congested pyridines and pyrimidines
作者:Ramendra Pratap、Brijesh Kumar、Vishnu Ji Ram
DOI:10.1016/j.tet.2007.07.062
日期:2007.10
An efficient and versatile synthesis of various congested pyridines 3a–h, 6a,b, 8a–n, 10a–g, and 16a,b, and (pyrimidin-4-yl)acetonitriles 13a–g has been delineated by base catalyzed ring transformation of suitably functionalized 2H-pyran-2-ones 1a–h, 5, 7, and 15 by formamidine acetate 2a, acetamidine hydrochloride 2b, S-methylisothiourea 9a, pyrazol-1-yl-carboxamidine 9b, and arylamidine hydrochloride
碱催化的环转化描述了各种拥挤的吡啶3a - h,6a,b,8a - n,10a - g和16a,b以及(嘧啶-4-基)乙腈13a - g的高效通用合成方法。适当官能2 ħ -吡喃-2-酮1A - H ^,5,7,和15由乙酸甲脒2A,乙脒盐酸盐2b中,小号-methylisothiourea图9a,吡唑-1-基甲脒9B,和芳脒盐酸盐12分别在粉末KOH的无水DMF的存在。