Synthesis of Bicyclo[4.1.0]tetrahydropyridazines by a Sequential [4 + 2] and [1 + 2] Annulation Reaction of Azoalkenes and Crotonate-Derived Sulfur Ylides
作者:Wenhao Yin、Ling Fang、Zhiyong Wang、Fang Gao、Zhefeng Li、Zhiyong Wang
DOI:10.1021/acs.orglett.9b02661
日期:2019.9.20
The base-induced unprecedented tandem [4 + 2] and [1 + 2] annulation reaction of in situ formed 1,2-diaza-1,3-dienes and crotonate-derived sulfur ylides is reported. This protocol provides a novel and practical method for the synthesis of cyclopropane-fused tetrahydropyridazines with a quaternary carbon center in synthetically useful yield. In this tandem reaction, three new bonds were formed in one
Construction of Azepino[2,3-<i>b</i>]indole Core via Sulfur Ylide Mediated Annulations
作者:Jun-Long Li、Qing-Song Dai、Kai-Chuan Yang、Yue Liu、Xiang Zhang、Hai-Jun Leng、Cheng Peng、Wei Huang、Qing-Zhu Li
DOI:10.1021/acs.orglett.8b03363
日期:2018.12.7
annulation of indoline-based aza-dienes and crotonate-derived sulfur ylides is described. This method could be further expanded by using more efficient synthetic strategies, including three-component [3 + 1 + 3] cascade and the direct sulfide-catalyzed [4 + 3] cyclization. These protocols enable the rapid construction of azepino[2,3-b]indole cores, and a broad spectrum of the desired products with diverse
Sequential Annulation Domino Reaction of Sulfur Ylides and α,β-Unsaturated Cyclic Ketimines: Synthesis of Cyclic 2-Alkenyl Aziridines
作者:Penghao Jia、You Huang
DOI:10.1021/acs.orglett.6b01045
日期:2016.5.20
A sequential annulation domino reaction of sulfur ylides and α,β-unsaturated cyclic ketimines for the construction of cyclic 2-alkenyl aziridines has been developed. Readily accessible starting materials, a one-pot procedure, excellent functional group compatibility, and mild conditions make this transformation a powerful tool for the synthesis of cyclic 2-alkenyl aziridines.
Divergent Domino Reactions of Sulfur Ylides: Access to Functionalized Six- and Seven-Membered Nitrogen–Heterocycles
作者:Junlong Chen、Penghao Jia、You Huang
DOI:10.1021/acs.orglett.8b02810
日期:2018.11.2
Divergent domino annulation reactions of sulfur ylides and azadienes were developed. A wide range of functionalized benzofuran-fused six- and seven-membered nitrogen–heterocyclic compounds were prepared in moderate to excellent yields under mild conditions. It is worth noting that the crotonate-derived sulfur ylides could be used as a novel C2 synthon or C3 synthon selectively by simply transforming