In Situ Generation of Quinolinium Ylides from Diazo Compounds: Copper-Catalyzed Synthesis of Indolizine
作者:Rongxiang Chen、Yanwei Zhao、Hongmei Sun、Ying Shao、Yudong Xu、Meihua Ma、Liang Ma、Xiaobing Wan
DOI:10.1021/acs.joc.7b01042
日期:2017.9.15
The Cu-catalyzedthree-component reaction between quinolines, diazo compounds, and alkenes has been established for direct construction of indolizine derivatives via quinolinium ylides. This methodology is distinguished by the use of a commercially inexpensive catalyst and readily available starting materials, wide substrate scope, and operational simplicity.
Copper(<scp>ii</scp>)-catalyzed cleavage of carbon–carbon triple bond to synthesize 1,2,3-triesterindolizines
作者:Jinwei Sun、Huayou Hu、Fuyao Wang、Hui Wu、Yun Liu
DOI:10.1039/c4ra06048b
日期:——
An efficient Cu(II)-catalyzed carbon–carbontriplebondcleavage protocol for the synthesis of 1,2,3-triesterindolizines via the reaction of pyridines with butynedioates has been developed. This reaction has perfect atom economy and both fragments from the cleaved alkyne are successively incorporated into the products.
We report a new copper-catalyzed [2 + 2 + 1] annulation process through the selective cleavage of sigma and triple C–C and C–Hbonds using two ynone units. This new methodology involves breaking multiple chemical bonds in a single operation, including C≡C, C–C, C–H, and N–O. These high-value adducts lead to a diverse collection of synthetically challenging trisubstituted indolizines by the simultaneous