Catalyst-Controlled [3 + 2] and [4 + 2] Annulations of Oximes with Propargyl Alcohols: Divergent Access to Indenamines and Isoquinolines
作者:Wanchun Gong、Zhi Zhou、Jingjing Shi、Bo Wu、Biyun Huang、Wei Yi
DOI:10.1021/acs.orglett.7b03546
日期:2018.1.5
Rhodium(III)- and iridium(III)-catalyzedC–H activation of oximes and coupling with propargyl alcohols is discussed. Depending on the catalyst, the reaction pathway switched between [3 + 2] and [4 + 2] annulations, thus giving divergent access to indenamines and isoquinolines in a one-pot and atom-economical manner. The hydroxyl group in the tertiary propargyl alcohol substrate was found to be crucial
Easy access to synthesize isoquinolines from aryl ketoximes and internal alkynes via Iridium (III)-catalyzed C H/N O bond activation
作者:Wei Lin、Xiu-Xiu Hu、Cang-Wei Zhuang、Ya-Zhen Wang
DOI:10.1016/j.tet.2019.04.039
日期:2019.5
A highly efficient approach to synthesize isoquinoline derivatives through Iridium(III)-catalyzed cyclization of aryl ketoximes and internal alkynes without oxidant is reported. A broad range isoquinolines are obtained in good to excellent yields and various functional groups are well tolerated.
One-Pot Synthesis of Oxime Ethers from Benzaldehyde or Acetophenone, Hydroxylamine Salt, Potassium Hydroxide, and Alkyl Halides
作者:Chunbao Li、Hang Zhang、Yi Cui、Shuanming Zhang、Zheyuan Zhao、Michael C. K. Choi、Albert S. C. Chan
DOI:10.1081/scc-120015807
日期:2003.1.4
Abstract Oxime ethers were synthesized in one-pot reaction from benzaldehyde or acetophenone, hydroxylamine hydrogen chloride, alkyl halides and KOH in aqueous DMSO. The reactions were completed in 15–50 min with yields in 80–96%.
A fast and site-selective biaryl synthesis via dehydrogenative C–H/C–H arylation in a ball mill was developed. In this paper, both electron-deficient oximes and electron-rich anilides quickly and under mild conditions provided arylation with various arenes to give the biaryl products in high-level selectivity. Given the solventless mechanochemical conditions, the transformation obviated the use of