Arylative Methylation of 2,3-Dihydropyrazines and Pyrazinones Using Dimethyl Sulfoxide as a C1 Source
作者:Kuntal Palit、Nayim Sepay、Niranjan Panda
DOI:10.1021/acs.joc.2c02675
日期:2023.3.3
pyrazinones using dimethyl sulfoxide as a nonconventional methylating agent under metal-free conditions was reported. Dimethyl sulfoxide-coordinated bromine cation pools generated from the treatment of dimethyl sulfoxide and 1,2-dibromoethane undergo Pummerer-type fragmentation to afford an electrophilic methyl(methylene)sulfonium ion for reaction with a carbon nucleophile followed by aromatization
据报道,在无金属条件下,使用二甲亚砜作为非常规甲基化试剂,α-C-H 甲基化吡嗪和吡嗪酮的不同合成。由二甲基亚砜和 1,2-二溴乙烷处理产生的二甲基亚砜配位的溴阳离子池经过 Pummerer 型碎裂,得到亲电甲基(亚甲基)硫鎓离子,用于与碳亲核试剂反应,然后芳构化得到 α-甲基化吡嗪和吡嗪酮类。