已经开发了一种简单有效的单锅多组分方法,该方法使用可回收的蒙脱石粘土负载的Cu(II)/ NaN 3催化体系,在水性条件下直接从相应的醛和末端炔烃直接合成3,5-二取代的异恶唑。“多米诺”一锅式MCR方法涉及醛的羟基胺化,然后氯化,然后生成反应性“腈”,该炔与炔烃进行1,3-偶极环加成反应,生成3,5-二取代异恶唑。该方法操作简单,区域选择性,经济,并且具有出色的官能团相容性,可以高收率合成结构多样的异恶唑。
Rhodium(II)-Catalyzed Formal [3 + 2] Cycloaddition of <i>N</i>-Sulfonyl-1,2,3-triazoles with Isoxazoles: Entry to Polysubstituted 3-Aminopyrroles
作者:Xiaoqiang Lei、Longbo Li、Yu-Peng He、Yefeng Tang
DOI:10.1021/acs.orglett.5b02570
日期:2015.11.6
A novel rhodium(II)-catalyzed formal [3 + 2] cycloaddition of N-sulfonyl-1,2,3-triazoles with isoxazoles has been achieved that provides an efficient method for the synthesis of polysubstituted 3-aminopyrrole derivatives. An operationally simple one-pot synthesis of the titled compounds from terminal alkynes, tosyl azide, and isoxazoles was also developed. The presented reaction affords an illustrative
Zinc-catalyzed reaction of isoxazoles with thioynol ethers involving an unprecedented 1,2-sulfur migration
作者:Xin-Qi Zhu、Qing Sun、Zhi-Xin Zhang、Bo Zhou、Pei-Xi Xie、Wen-Bo Shen、Xin Lu、Jin-Mei Zhou、Long-Wu Ye
DOI:10.1039/c8cc03140a
日期:——
A novel zinc-catalyzed reaction of isoxazoles with thioynol ethers involving an unprecedented 1,2-sulfur migration has been developed, which represents the first example of a non-noble metal-catalyzed reaction between isoxazoles and alkynes. This method allows the facile and atom-economical synthesis of a range of valuable β-keto enamides. Moreover, the computational study provides further evidence
Synthesis of Isoxazoles via One-Pot Oxidation/Cyclization Sequence from Propargylamines
作者:Mengyan Duan、Guodong Hou、Yabiao Zhao、Congjun Zhu、Chuanjun Song
DOI:10.1021/acs.joc.2c00896
日期:2022.8.19
A facile strategy for the synthesis of isoxazoles has been efficaciously developed, which involves oxidation of propargylamines to the corresponding oximes followed by CuCl-mediated intramolecular cyclization of the latter. This protocol shows a straightforward way to construct a series of isoxazole cores with a wide range of functional group compatibility. Meanwhile, a gram-scale experiment and synthetic
An Alkynyliodide Cycloaddition Strategy for the Construction of Iodoisoxazoles
作者:James A. Crossley、Duncan L. Browne
DOI:10.1021/jo1011174
日期:2010.8.6
The thermally promoted cycloaddition between alkynyliodides and nitrite oxides is reported. The process offers excellent regioselectivity and a broad scope with respect to both the iodoalkynes and chloro-oximes. Further functionalization of the highly decorated iodoisoxazole motifs can be achieved via Suzuki cross-coupling.
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