Site-Selective C–H Alkylation of Diazine <i>N</i>-Oxides Enabled by Phosphonium Ylides
作者:Prithwish Ghosh、Na Yeon Kwon、Sangil Han、Saegun Kim、Sang Hoon Han、Neeraj Kumar Mishra、Young Hoon Jung、Sang J. Chung、In Su Kim
DOI:10.1021/acs.orglett.9b02365
日期:2019.8.16
The synthesis of alkylated diazine derivatives is important for their practical utilization as pharmaceuticals and for other purposes. Herein, we describe the metal-free site-selective C–H alkylation of diazine N-oxides using phosphonium ylides that affords a variety of alkylated diazine derivatives with broad functional group tolerance. The utility of this method is showcased by the late-stage functionalization
烷基化的二嗪衍生物的合成对于它们作为药物的实际应用和其他目的是重要的。在本文中,我们描述了使用磷鎓叶立德的无金属位点选择性地使二嗪N-氧化物进行CH烷基化,该phospho鎓可提供具有宽泛的官能团耐受性的各种烷基化的二嗪衍生物。该方法的实用性通过市售药物(例如缬尼克兰)的后期功能化得以展示。值得注意的是,吡嗪N-氧化物的顺序C–H烷基化可完全合成含吡嗪的天然产物paenibacillin A,突出了该方法的重要性。