Metal-free [2 + 1 + 3] Cycloaddition of Trifluoroacetaldehyde <i>N</i>-Sulfonylhydrazones with Hexahydro-1,3,5-triazines Leading to Trifluoromethylated 2,3,4,5-Tetrahydro-1,2,4-triazines
作者:Zhongxue Fang、Qihao Jin、Xinyu Wang、Yongquan Ning
DOI:10.1021/acs.joc.1c02810
日期:2022.3.4
A transition-metal-free [2 + 1 + 3] cycloaddition of trifluoroacetaldehyde N-sulfonylhydrazone and hexahydro-1,3,5-triazine was described. This operationally simple protocol provides a general synthesis of diverse trifluoromethylated 2,3,4,5-tetrahydro-1,2,4-triazines in 81–97% yield with a broad substrate scope, including aryl, benzyl, and alkyl hexahydro-1,3,5-triazine.
Lewis Acid-Catalyzed Synthesis of Polysubstituted Furans from Conjugated Ene-yne-ketones and 1,3,5-Triazinanes
作者:Qiuxia Jiang、Anquan Li、Xiang Liu、Yue Yu、Baofu Zhu、Hua Cao
DOI:10.1021/acs.joc.2c00182
日期:2022.6.3
An efficient and metal-free approach to the construction of diverse functionalized furan derivatives has been developed from ene-yne-ketones and 1,3,5-triazinanes. As an atom-economical and environment-friendly protocol, the new conditions are suitable for selective C–N and C–O bond formation of a wide range of polysubstituted furans in one pot.