A novel protocol for the efficient activation of the Beckmannrearrangement utilizing the readily available sulfuryl fluoride (SO2F2 gas) is reported. The substrate scope of this methodology has been demonstrated by 37 examples with good to nearly quantitative isolated yields in a short time. A tentative mechanism was proposed involving formation and elimination of sulfonyl ester.
报道了一种利用容易获得的硫酰氟(SO 2 F 2气体)有效激活贝克曼重排的新方案。该方法的底物范围已通过37个实例证明,并在短时间内获得了良好至近乎定量的分离产率。提出了一种尝试性的机制,涉及形成和消除磺酰基酯。
Palladium-catalyzed Csp<sup>2</sup>–H carbonylation of aromatic oximes: selective access to benzo[d][1,2]oxazin-1-ones and 3-methyleneisoindolin-1-ones
A selective palladium-catalyzed carbonylation of Csp2–H bonds with aromatic oximes for the synthesis of benzo[d][1,2]oxazin-1-ones and 3-methyleneisoindolin-1-ones has been developed.
Rh(III)- and Zn(II)-Catalyzed Synthesis of Quinazoline <i>N</i>-Oxides via C–H Amidation–Cyclization of Oximes
作者:Qiang Wang、Fen Wang、Xifa Yang、Xukai Zhou、Xingwei Li
DOI:10.1021/acs.orglett.6b03155
日期:2016.12.2
Quinazoline N-oxides have been prepared from simple ketoximes and 1,4,2-dioxazol-5-ones via Rh(III)-catalyzed C–H activation–amidation of the ketoximes and subsequent Zn(II)-catalyzed cyclization. The substrate scope and functional group compatibility were examined. The reaction features relay catalysis by Rh(III) and Zn(II).
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.
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.