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-selectiveC–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
Synthesis and initial thermal behavior investigation of 2-alkenyl substituted pyrazine N-oxides
作者:Ke Zhai、Miao Lai、Zhiyong Wu、Mingqin Zhao、Yanqiu Jing、Pengfei Liu
DOI:10.1016/j.catcom.2018.07.017
日期:2018.11
The systematic syntheses of 2-alkenylpyrazine N-oxides through palladium-catalyzed C-2 selective CH olefination reaction was disclosed. Various acrylateesters substituted pyrazine N-oxides were obtained in up to 93% yields. Thermogravimetric analysis indicated that the fracture temperature of particular compound 3 f was about 267 °C. The pyrolysis of compound 3 f could generate several aroma compounds