Tunable Phosphine-Triggered Cascade Reactions of MBH Derivatives and 3-Acyl-2<i>H</i>-chromen-2-ones: Highly Selective Synthesis of Diverse Chromenones
作者:Wei Yuan、Hu-Fei Zheng、Zhi-Hua Yu、Zi-Long Tang、De-Qing Shi
DOI:10.1002/ejoc.201301358
日期:2014.1
Diversechromenones were synthesized through tunable phosphine-mediated cascadereactions between 3-acyl-2H-chromen-2-ones and Morita–Baylis–Hillman (MBH) derivatives. With different phosphine loadings and reaction temperatures, MBHderivatives act either as C1 or C3 synthons for the construction of potential biologically active 3-dihydrofuran-fused chromen-2-ones, 4-allyl-3-acyl-chromen-2-ones, or
Stabilized Sulfur Ylide Mediated Cyclopropanations and Formal [4+1] Cycloadditions of 3-Acyl-2<i>H</i>-chromenones and Their Imines
作者:Xiang-Suo Meng、Shan Jiang、Xiao-Yun Xu、Qiang-Xian Wu、Yu-Cheng Gu、De-Qing Shi
DOI:10.1002/ejoc.201600759
日期:2016.10
Stabilizedsulfurylidemediatedcyclopropanation and formal [4+1] cycloaddition of 3-acyl-2H-chromenones and their imines were explored. The transformations could be performed under mild conditions and were shown to have wide substrate scopes and significant functional-group tolerance; furthermore, the reactions proceeded with excellent regioselectivity. Thus, they are powerful methods for the one-pot
Organocatalytic Asymmetric Cyclopropanation of 3-Acylcoumarins with 3-Halooxindoles: Access to Spirooxindole-cyclopropa[<i>c</i>]coumarin Compounds
作者:Wei-Cheng Yuan、Chuan-Wen Lei、Jian-Qiang Zhao、Zhen-Hua Wang、Yong You
DOI:10.1021/acs.joc.0c02653
日期:2021.2.5
diastereo- and enantioselective cyclopropanation reaction of 3-acylcoumarins with 3-halooxindoles catalyzed by an organocatalyst through a [2 + 1] Michael/intramolecular cyclization process was developed. This scenario provides a facile strategy to access spirooxindole-cyclopropa[c]coumarin compounds bearing three continuous stereocenters, including two vicinal quaternaryall-carbonstereocenters with high
通过[2 + 1] Michael /分子内环化过程,开发了3-酰基香豆素与3-卤代新多酚的高度非对映和对映选择性的环丙烷化反应。此方案提供了一种简便的策略,可访问带有三个连续立体中心(包括两个邻位季铵全碳立体中心,具有高到极好的非对映和对映选择性的螺环吲哚-环丙烷[ c ]香豆素化合物)。HRMS研究表明,叶立铵中间体在催化过程中至关重要。
Diversity-Oriented Synthesis of Coumarin-Fused Cyclopentanones via a Nucleophilic Phosphine Controlled Cascade Reaction
作者:Qi Huang、Junfeng Fu、Xiaoyu Han、Zhixin Chang、Wenhao Gan、Yongjiang Wang
DOI:10.1055/s-0041-1738399
日期:2022.8
phosphine-promoted intermolecular annulation reaction of functionalized 3-benzoyl coumarin with alkynone has been disclosed. This reaction was found to be highly dependent on the nucleophilicity of the phosphine. Two classes of coumarin-fused cyclopentanones were selectively afforded in moderate to good yields with excellent diastereoselectivities under the mild reaction conditions.