common oxidization to carbonyl group in secondary propargyl alcohols was successfully developed to form 2-benzyl substituted isoquinoline N-oxides by a Rhodium-catalyzed C−H activation and annulation cascade, in which moderate to excellent yields (up to 92%) could be obtained under mild reaction conditions, along with good regioselectivity, broad generality and applicability.
Gold-catalyzed isomerization of unactivated allenes into 1,3-dienes under ambient conditions
作者:Chun-Ming Ting、Yi-Ling Hsu、Rai-Shung Liu
DOI:10.1039/c2cc32131a
日期:——
We have developed a gold-catalyzed isomerization of unactivated allenes into 1,3-dienes with nitrosobenzene as an additive. This reaction proceeded almost exclusively at room temperature for highly substituted allenes. The utility of this reaction is manifested by the development of one-pot [4+2]-cycloaddition of allenes and reactive alkenes.
Ruthenium(II)-Catalyzed Redox-Neutral [3+2] Annulation of Indoles with Internal Alkynes via C–H Bond Activation: Accessing a Pyrroloindolone Scaffold
作者:Yanan Xie、Xiaowei Wu、Chunpu Li、Jiang Wang、Jian Li、Hong Liu
DOI:10.1021/acs.joc.7b00575
日期:2017.5.19
Ru(II)-catalyzed redox-neutral [3+2] annulation reactions of N-ethoxycarbamoyl indoles and internal alkynes via C–H bond activation are reported. This method features a broad internal alkyne scope, including various aryl/alkyl-, alkyl/alkyl-, and diaryl-substituted alkynes, good to excellent regioselectivity, diverse functional group tolerance, and mild reaction conditions. The N-ethoxycarbamoyl directing
Regio-selective and stereo-selective hydrosilylation of internal alkynes catalyzed by ruthenium complexes
作者:Wenhao Dai、Xiaowei Wu、Chunpu Li、Rui Zhang、Jiang Wang、Hong Liu
DOI:10.1039/c8ra04083d
日期:——
In this study, ruthenium(II)-catalyzed direct hydrosilylation of internal alkynes with high regio-selectivity and stereo-selectivity is reported. This title transformation led to various vinylsilanes in good to excellent yields. This approach features mild reaction conditions, low catalyst loading, air-stability, and good functional group tolerance. Furthermore, gram-scale preparation and some transformations
本研究报道了具有高区域选择性和立体选择性的钌( II )催化的内部炔烃的直接氢化硅烷化。这种标题转变导致各种乙烯基硅烷的产率从良好到极好。该方法具有反应条件温和、催化剂负载量低、空气稳定性好、官能团耐受性好等特点。此外,对乙烯基硅烷进行了克级制备和一些转化,进一步强调了其合成效用和适用性。
Rhodium(III)-catalyzed selective access to isoindolinones via formal [4 + 1] annulation of arylamides and propargyl alcohols
作者:Youwei Xu、Fen Wang、Songjie Yu、Xingwei Li
DOI:10.1016/s1872-2067(17)62881-x
日期:2017.8
Abstract A mild and efficient oxidative synthesis of isoindolinones has been realized by Rh(III)-catalyzed C–H activation of benzamides and [4 + 1] coupling with propargyl alcohols. This coupling system proceeds with broad substrate scope and mild conditions and provides a new approach to access the useful skeleton of γ -lactams with a stereogenic center.