Ruthenium-Catalyzed C-H Amidation and Alkenylation of Cyclic<i>N</i>-Sulfonyl Ketimines
作者:Ramasamy Manoharan、Masilamani Jeganmohan
DOI:10.1002/ejoc.201600505
日期:2016.8
A highly regioselective ruthenium-catalyzedC–Hamidation of cyclic N-sulfonyl ketimines with organic sulfonyl azides is described. An alkenylation at the C–H bond of cyclic N-sulfonyl ketimines with various alkenes was also carried out. Only a catalytic amount of the oxidant Cu(OAc)2 was used in the reaction; the remainder of the required amount of oxidant was formed by regeneration of Cu(OAc)2 under
Rhodium‐Catalyzed Spirocyclic Sultam Synthesis by [3+2] Annulation with Cyclic
<i>N</i>
‐Sulfonyl Ketimines and Alkynes
作者:Lin Dong、Chuan‐Hua Qu、Ji‐Rong Huang、Wei Zhang、Qian‐Ru Zhang、Jin‐Gen Deng
DOI:10.1002/chem.201303372
日期:2013.12.2
Atom‐economical addition: RhIII‐catalyzed “Grignard‐type” cyclization between cyclic N‐sulfonyl ketimines and internal alkynes has been developed to afford multifunctional spirocyclic sultam products in high yields (up to 99 %) under mild conditions (see scheme, Cp* = pentamethylcyclopentadienyl, DCE = 1,2‐dichloroethane).
A highly efficient photocatalyticaerobicoxidation of cyclic sulfamides to synthesize cyclic N-sulfonyl imines with Ir(ppy)2(dtbpy)PF6 as photocatalyst is reported. These environmentally friendly transformations exihibit good to excellent isolated yields and good generality with respect to both five-membered and six-membered cyclic sulfamides.
Ir(III)/MPAA-Catalyzed Mild and Selective C–H Amidation of <i>N</i>-Sulfonyl Ketimines: Access To Benzosultam-Fused Quinazolines/Quinazolinones
作者:Aniket Mishra、Upasana Mukherjee、Tripta Kumari Vats、Indubhusan Deb
DOI:10.1021/acs.joc.8b00125
日期:2018.4.6
unprecedented mild C–H amidation for weakly coordinating cyclic N-sulfonyl ketimines, accelerated by a mono protected l-amino acid, has been developed. The method uses 1,4,2-dioxazol-5-ones as the robust amidating reagent in conjunction with a catalytic amount of silver triflate. It is highlyselective and does not require a stoichiometric amount of oxidants or additives. A series of mechanistic experiments
已经开发了Ir(III)催化的空前温和的C H H酰胺化,用于弱配位的环状N-磺酰基酮亚胺,由一个单保护的1-氨基酸促进。该方法与催化量的三氟甲磺酸银一起使用1,4,2-二恶唑-5-酮作为强力酰胺化试剂。它具有很高的选择性,不需要化学计量的氧化剂或添加剂。进行了一系列的机械实验,以获取对反应机理的一些见解。该策略可轻松获得具有药学相关功能的新型苯并舒坦-喹唑啉和苯并舒坦-喹唑啉酮杂合支架。
Iridium-catalyzed direct C–H arylation of cyclic <i>N</i>-sulfonyl ketimines with arylsiloxanes at ambient temperature
作者:Writhabrata Sarkar、Arup Bhowmik、Sumit Das、Aiswarya Balaram Sulekha、Aniket Mishra、Indubhusan Deb
DOI:10.1039/d0ob01212b
日期:——
A highly efficient iridium-catalyzed ortho-selective C–H arylation of weakly coordinating cyclic N-sulfonyl ketimines has been achieved with environmentally benign aryl siloxanes at ambient temperature giving access to a novel class of biaryls.