Multicomponent Coupling Cyclization Access to Cinnolines via in Situ Generated Diazene with Arynes, and α-Bromo Ketones
作者:Wen-Ming Shu、Jun-Rui Ma、Kai-Lu Zheng、An-Xin Wu
DOI:10.1021/acs.orglett.5b03236
日期:2016.1.15
A transition-metal-freemulticomponent coupling cyclization reaction was explored involvingarynes, tosylhydrazine, and α-bromo ketones. The reaction proceeds via a formal [2 + 2 + 2] cycloaddition, giving access to cinnoline derivatives in moderate yields under mild conditions. Three chemical bonds were formed—two C–N bonds and one C–C bond—in a single step.
Stevens rearrangement of thioethers with arynes: a facile access to multi-substituted β-keto thioethers
作者:Xiao-Bo Xu、Zi-Hua Lin、Yuyin Liu、Jian Guo、Yun He
DOI:10.1039/c7ob00277g
日期:——
An effective method for the synthesis of multi-substituted β-keto thioethers via Stevens rearrangement of simple β-keto thioethers with arynes has been developed. In these reactions, successive C–S/C–H/C–C bonds were formed in one pot under mild and transition-metal free conditions to afford multi-substituted β-keto thioethers in moderate to good yields.
Metal-free, high yielding synthesis of unsymmetrical biaryl, bi(heteroaryl), aryl vinyl, aryl alkyl sulfones via coupling of aryne with sulfinic acid salts
作者:Sravan Kumar Aithagani、Kushalava Reddy Yempalla、Gurunadham Munagala、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1039/c4ra07370c
日期:——
Here, we report a metal-free, high yielding method for the synthesis of unsymmetrical biaryl sulfones via coupling of aryne with sulfinic acid salts. The optimized condition also works efficiently for bi(heteroaryl), arylvinyl and aryl alkyl sulfones. The present method took comparatively shorter reaction times and has good functional group compatibility.
Synthesis of Dihydroquinolinone Derivatives via the Cascade Reaction of <i>o</i>-Silylaryl Triflates with Pyrazolidinones
作者:Mengyang Shen、Jie Zhao、Yuanshuang Xu、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.1c01814
日期:2021.11.5
Presented herein is a novel synthesis of dihydroquinolinone derivatives through an unprecedented cascadereaction of o-silylaryl triflates with pyrazolidinones. Mechanistically, the formation of the title products is believed to involve a cascade procedure including in situ formation of aryne and its addition with pyrazolidinone followed by N–N bond cleavage and intramolecular C–C bond formation/annulation
Formal [7 + 2] Cycloaddition of Arynes with <i>N</i>-Vinyl-α,β-Unsaturated Nitrones: Synthesis of Benzoxazonines and Their N–O Bond Cleavage
作者:Xiao-Pan Ma、Liang-Gui Li、Hong-Ping Zhao、Min Du、Cui Liang、Dong-Liang Mo
DOI:10.1021/acs.orglett.8b01761
日期:2018.8.3
N-vinyl-α,β-unsaturated nitrones under mild conditions. Controllable N–O bond cleavage of benzoxazonines afforded polysubstituted pyrrole-tethered benzopyrans and acyclic ketone-substituted phenols in moderate to good yields. Further transformations provided a facile approach to access useful building blocks with specific stereoselectivity.