Synthesis of (E)-β-iodo vinylsulfones via iodine-promoted iodosulfonylation of alkynes with sodium sulfinates in an aqueous medium at room temperature
作者:Yadong Sun、Ablimit Abdukader、Dong Lu、Haiyan Zhang、Chenjiang Liu
DOI:10.1039/c6gc03387c
日期:——
An efficient and facile molecular iodine-promoted method for the synthesis of (E)-[small beta]-iodo vinylsulfones with high regio- and stereoselectivity using water as the solvent at room temperature is presented.
ABSTRACT ABSTRACT The present reaction provides a simple and convenient synthetic strategy to construct β-iodovinyl sulfones through molecular iodine and DTBP (di-tert-butyl peroxide) promoted difunctionalization of alkynes with sodium benzenesulfinates under mild and environmentally-benign conditions. A series of substituted (E)-β-iodovinyl sulfones were synthesized with excellent stereo- and regio-selectivities
Iodosulfonylation of Alkynes under Ultrasound Irradiation
作者:Xianghua Zeng、Chuanjiang Zhou
DOI:10.1055/a-1559-3346
日期:2021.12
ultrasound irradiation using alkynes, sulfonyl hydrazides, potassium iodide and hydrogen peroxide. The key features of this protocol are the speed and efficiency of the reactions, which afford good to excellent yields of the desired products by employing ultrasound as the driving force. Mechanistic studies reveal that a sulfonyl radical intermediate is generated via sulfonyl iodide homolysis.
An iodine-mediated new avenue to sulfonylation employing <i>N</i>-hydroxy aryl sulfonamide as a sulfonylating agent
作者:Dushyant Singh Raghuvanshi、Narsingh Verma
DOI:10.1039/d1ob00036e
日期:——
A novel and highly efficient I2/K2CO3 mediated regioselective sulfonylation of thiophenols, aryl acetylenic acid and aromatic alkynes with N-hydroxy sulfonamide has been developed.
with 1-aminopyridinium iodide is realized to access 2-substituted pyrazolo[1,5-a]pyridines in good to high yields. An essential modification of the dipolar N-tosylpyridinium imide allows the first preparative synthesis of 3-sulfonyl-pyrazolo[1,5-a]pyridines in moderate to high yields. Of note, the metal-free protocol features a broad substrate scope with good functional group tolerance and compatibility
吡唑并[1,5- a ]吡啶继续在药物化学中占据特殊地位,但3-磺酰基类似物的直接构建仍未探索。在碱性条件下,吡啶鎓-N-胺和相应的偶极胺在使用( E )-β-碘乙烯基砜的[3 + 2]-环加成反应中发挥了重要作用。K 2 CO 3介导的 ( E )-β-碘乙烯基砜与 1-氨基吡啶碘化物的串联环环脱磺酰基化反应以良好至高产率获得 2-取代的吡唑并[1,5- a ]吡啶。偶极N的基本修改-tosylpyridinium imide 首次以中等至高产率制备合成 3-磺酰基-吡唑并[1,5- a ] 吡啶。值得注意的是,无金属协议具有广泛的底物范围,具有良好的官能团耐受性和兼容性。通过克级反应证明了该过程的有效性,并根据具体结果提出了合理的机制。