作者:Enric Lizano、Josep Grima、M. Dolors Pujol
DOI:10.1055/s-0039-1690183
日期:2019.10
2-Aminopyrazine was halogenated with NIS, NCS, and NBS under different reaction conditions. Chlorination and bromination were achieved with good yields by using acetonitrile as the solvent. However, iodination was only obtained in poor yields. Undoubtedly, the best conditions for both mono- and dihalogenation were the use of NBS, acetonitrile, and microwave assistance for short periods. 3,5-Dibromo-2-aminopyrazine
2-氨基吡嗪在不同的反应条件下被 NIS、NCS 和 NBS 卤化。以乙腈为溶剂,氯化和溴化反应收率良好。然而,碘化的收率很低。毫无疑问,单卤化和二卤化的最佳条件是短时间使用 NBS、乙腈和微波辅助。3,5-Dibromo-2-aminopyrazine 是合成氮杂环的优良官能化原料。