Chinese Journal of Organic Chemistry ›› 2021, Vol. 41 ›› Issue (7): 2831-2838.DOI: 10.6023/cjoc202102026 Previous Articles     Next Articles

ARTICLES

N,N-二甲基甲酰胺(DMF)促进羟基氮杂环与卤代烃的专一性N-烷基化反应: 直接高效的吡啶酮类化合物合成方法

韩峰a, 王婷b, 冯斌a, 徐清a,b,*()   

  1. a 温州大学化学与材料工程学院 浙江温州 325035
    b 扬州大学化学化工学院 江苏扬州 225002
  • 收稿日期:2021-02-12 修回日期:2021-03-16 发布日期:2021-04-06
  • 通讯作者: 徐清
  • 基金资助:
    国家自然科学基金(21672163); 浙江省自然科学杰出青年基金(LR14B020002)

N,N-Dimethylformamide (DMF)-Promoted SpecificN-Alkylation of Hydroxyl N-Heterocycles with Organohalides: A Direct and Efficient Method for Synthesis of Pyridone Derivatives

Feng Hana, Ting Wangb, Bin Fenga, Qing Xua,b()   

  1. a College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035
    b School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002
  • Received:2021-02-12 Revised:2021-03-16 Published:2021-04-06
  • Contact: Qing Xu
  • Supported by:
    National Natural Science Foundation of China(21672163); Natural Science Foundation of Zhejiang Province for Distinguished Young Scholars(LR14B020002)

In base-free specificN-alkylation of hydroxylN-heterocycles with organohalides producing pyridone-type products,N,N-dimethylformamide (DMF) was found to be the best solvent for having the most prominent solvent effect among the usual solvents. This not only led to milder reaction conditions and higher yields of the products, but also could broaden the substrate scope of the reaction. Mechanistic studies and the literature revealed that, in addition to the usual solvent effect, DMF can decompose to produce dimethylamine during the reaction, which then works as a base to promote the reaction.

Key words: hydroxylN-heterocycle, organohalide, pyridone, N-alkylation, N,N-dimethylformamide (DMF), solvent effect