An efficient method is developed for the synthesis of functionalizedbenzimidazoles and perimidines by the condensation of aryl diamines with β‐carbonyl compounds catalyzed by ytterbiumchloride. The reactions give good yields under mild conditions. A mechanism involving a lanthanide activated CCbondcleavage is proposed.
Photoinduced rearrangement of vinyl tosylates to β-ketosulfones
作者:Lili Xie、Xiaomeng Zhen、Shuping Huang、Xiaolong Su、Mai Lin、Yi Li
DOI:10.1039/c7gc01467h
日期:——
We developed a photoinduced radical fragmentation and rearrangement of vinyl tosylates that enables efficient formation of -ketosulfones. The process is based on photoinitiated homolysis of vinyl tosylate to release sulfinyl radical from the tosyl group of and subsequent addition of sulfinyl radical to another vinyl tosylate form the desired -ketosulfones. This simple protocol features board scope
Solvent-free facile synthesis of novel α-tosyloxy β-keto sulfones using [hydroxy(tosyloxy)iodo]benzene
作者:Dalip Kumar、M. Swapna Sundaree、Gautam Patel、V.S. Rao、Rajender S. Varma
DOI:10.1016/j.tetlet.2006.09.107
日期:2006.11
A facile, general and high yielding protocol for the synthesis of novel α-tosyloxy β-keto sulfones is described utilizing relatively non-toxic, [hydroxy(tosyloxy)iodo]benzene, under solvent-free conditions at room temperature.
Transition-metal-free insertion of alkynes into the C–C σ-bond of cyclic β-keto sulfones: an atom-economical way to medium-size-ring sulfonyl derivatives
作者:Yingge Gu、Yajie Yang、Ye Wang、Zongkang Wang、Yilin Zhu、Yanzhong Li
DOI:10.1039/d2nj01197b
日期:——
efficient strategy for the preparation of medium-size-ring sulfonyl derivatives has been developed. This method is realized by alkynes insertion into the C–C σ-bond of cyclic β-keto sulfones, introducing sulfonyl groups into medium-size-ring compounds. This reaction possesses competitive features such as broad substrate scope, transition-metal-free and atom economy.