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。
Tetrabutylammonium Iodide Mediated Synthesis of β-Alkoxy Sulfides and Vinyl Sulfones by Using Benzenesulfonyl Chlorides as the Sulfur Sources under Acidic or Alkaline Conditions
作者:Sen Lin、Shengmei Guo、Dingyi Wang、Rongxing Zhang、Zhaohua Yan
DOI:10.1055/s-0035-1561667
日期:——
from benzenesulfonylchlorides and alkenes is described. Under acidic condition, a wide range of β-alkoxy sulfides were obtained in good to excellent yields, whereas under alkaline conditions, various vinyl sulfones were produced in moderate to good yields. A novel preparation of (E)-β-iodovinyl sulfones was achieved through direct difunctionalization of alkynes with benzenesulfonylchlorides and TBAI
Iodine promoted iodosulfonylation of alkynes with sulfonyl hydrazides in an aqueous medium: highly stereoselective synthesis of (<i>E</i>)-β-iodo vinylsulfones
作者:Yunlei Hou、Liangyu Zhu、Hao Hu、Shaowei Chen、Zefei Li、Yajing Liu、Ping Gong
DOI:10.1039/c8nj01145a
日期:——
metal-free sulfonylation reaction for the preparation of (E)-β-iodo vinylsulfones from alkynes with sulfonyl hydrazides and molecular iodine was efficiently developed under mild and environmentally benign conditions, in water without any ligand or catalyst. The reaction gave a range of structurally diverse β-iodo vinylsulfones with excellent E selectivities and high yields.
A novel protocol for synthesis of (E)-β-Iodovinyl sulfones via NaI-mediated of aryl sulfonyl chloride with alkynes is described, featuring transition-metal-free condition, commercial available substrates, convenient operation, as well as good functional group compatibility. A wide variety of substrate application and good functional group tolerance is provided by this approach, giving multiple (E)-β-Iodovinyl
描述了一种通过 NaI 介导的芳基磺酰氯与炔烃合成 ( E ) -β-碘乙烯基砜的新方案,具有无过渡金属条件、市售底物、操作方便以及良好的官能团兼容性。这种方法提供了多种底物应用和良好的官能团耐受性,提供了多种 ( E )- β -碘乙烯基砜类似物,具有出色的产率(高达 98%,> 4 g 规模)。
Electrochemical Induced Regio‐ and Stereoselective Difunctionalization of Alkynes: The Synthesis of (
<i>E</i>
)‐β‐Iodovinyl Sulfones
作者:Xinghua Zhang、Danna Lu、Zhenwei Wang
DOI:10.1002/ejoc.202100505
日期:2021.8.13
An efficient method for electrochemical iodosulfonylation of alkynes was developed under oxidant-free condition. This procedure affords valuable β-iodovinyl sulfones with broad substrate scope, excellent regio- and stereoselectivity. Moreover, this facile protocol can be applied to gram-scale synthesis of (E)-β-iodovinyl sulfone.
在无氧化剂条件下开发了一种有效的炔烃电化学碘磺酰化方法。该程序提供了有价值的 β-碘乙烯基砜,具有广泛的底物范围、出色的区域和立体选择性。此外,这种简便的方案可应用于 ( E )-β-碘乙烯基砜的克级合成。