Highly diastereoselective spiro-cyclopropanation of 2-arylidene-1,3-indanediones and dimethylsulfonium ylides
作者:Jie Huang、Shaofa Sun、Ping Ma、Jian Wang、Kevin Lee、Yalan Xing、Yang Wu、Gangqiang Wang
DOI:10.1039/d1nj02886c
日期:——
This efficient and simple protocol features simple operations, mild conditions and excellent functional group compatibility. A variety of structurally interesting spiro-cyclopropanes were prepared in excellent yields and diastereomeric ratios (up to 97% yield and 20 : 1 dr). Also, ring expansion of the cyclopropanation product to quickly deliver a complex indeno[1,2-c]pyridazine structure showcased
2-亚芳基-1,3-茚二酮和二甲基锍叶立德的高度非对映选择性螺环丙烷化反应已通过碱诱导环化开发。这种高效简单的方案具有操作简单、条件温和、功能组兼容性好等特点。以优异的产率和非对映体比率(高达 97% 的产率和 20:1 dr)制备了各种结构有趣的螺环丙烷。此外,环丙烷化产物的扩环以快速提供复杂的茚并[1,2- c ]哒嗪结构展示了该方法的有趣应用。
An efficient synthesis of 2-isoxazolines from α-haloketone oximes and dimethyl sulfonium salts
作者:Sen Zhao、Hang Wang、Shaofa Sun、Haibing Guo、Zhiyu Chen、Jian Wang、Lu Wang、Steven Liang、Gangqiang Wang
DOI:10.1016/j.tetlet.2018.12.062
日期:2019.1
2-Isoxazolines were synthesized efficiently from a formal [4+1] cycloaddition of nitrosoalkenes and sulfurylides, which were generated in situ from α-haloketone oximes and dimethyl sulfonium salts. This approach provides a new method to synthesize a range of 2-isoxazolines in high yields and high regioselectivity.
Synthesis of α-sulfanyl-β-amino acid derivatives by using nanocrystalline magnesium oxide
作者:M. Lakshmi Kantam、Koosam Mahendar、Bojja Sreedhar、Boyapati. M. Choudary、Suresh K. Bhargava、Steven H. Priver
DOI:10.1016/j.tet.2010.05.002
日期:2010.7
The Mannich-type reaction between alkyl, aryl and heterocyclic aldimines and sulfonium salts for the synthesis of α-sulfanyl-β-amino acidderivatives by using nanocrystalline magnesium oxide (NAP-MgO) is described. These products are obtained in moderate to high yields with moderate diastereoselectivities. The configuration of ethyl-3-[(4-methylphenyl)sulfonyl]amino}-2-(methylsulfanyl)-3-(4-nitrophenyl)propanoate
描述了烷基,芳基和杂环亚胺与M盐之间的曼尼希型反应,用于通过使用纳米晶状氧化镁(NAP-MgO)合成α-硫烷基-β-氨基酸衍生物。这些产品以中等至高收率获得,具有适度的非对映选择性。X射线衍射技术已证实3-[[(4-甲基苯基)磺酰基]氨基} -2-(甲基硫烷基)-3-(4-硝基苯基)丙酸乙酯(主要异构体)的构型是抗,并与基于1 H NMR光谱的赋值一致。这些α-硫烷基-β-氨基酸衍生物是具有强生物活性的药物的重要组成部分。
Construction of a Benzo[<i>b</i>]azepine Skeleton through Decarboxylative Ylide [6+1] Annulations with Modified Vinyl Benzoxazinanones
作者:Qing-Zhu Li、Zhi-Qiang Jia、Lin Chen、Xiang Zhang、Hai-Jun Leng、Rong Zeng、Yan-Qing Liu、Wen-Lin Zou、Jun-Long Li
DOI:10.1021/acs.orglett.0c04041
日期:2021.2.5
A Lewis acid-promoted [6+1] annulation between sulfur ylides and modified vinyl benzoxazinanones was described. In this reaction, the newly designed vinyl benzoxazinanones could serve as a novel six-atom synthon, and the key to success is the installation of an electron-withdrawing group on the alkene moiety of the benzoxazinanones. A broad range of substrates are compatible with this mild reaction
描述了路易斯酸促进硫基化物和改性乙烯基苯并恶嗪酮之间的[6 + 1]环化。在该反应中,新设计的乙烯基苯并恶嗪酮可以用作新型的六原子合成子,成功的关键是在苯并恶嗪酮的烯烃部分上安装了一个吸电子基团。各种各样的底物都与这种温和的反应体系兼容,从而为构建苯并[ b ]氮杂骨架提供了简便实用的方法。