4-二甲基氨基或4-甲氧基吡啶与炔二羧酸酯和亚芳基氰乙酸酯的三组分反应显示出非常有趣的分子多样性。多取代的1,8,9,9a-四氢-4 H -1,4-乙基喹啉衍生物,2 H-吡喃-2,3-二羧酸盐和buta-1,3-二烯-1,2,4-三羧酸盐衍生物可以取决于底物和反应条件,可以高收率和良好的非对映选择性形成二价铁。
Convenient Synthesis of Functionalized 6-Styryl-1,4,5,6-tetrahydropyridines through a Domino [2+2+2] Cycloaddition Reaction
作者:Jing Zhang、Wen-Juan Yang、Jing Sun、Chao-Guo Yan
DOI:10.1002/ejoc.201501052
日期:2015.12
The domino [2+2+2] cycloadditionreaction of α,β-unsaturated N-arylaldimines, dialkyl acetylenedicarboxylates, and arylidenemalononitriles in dry acetonitrile at room temperature afforded polysubstituted 6-styryl-1,4,5,6-tetrahydropyridines in good yields with various cis/trans-isomer ratios. The similar three-component reaction that contains ethyl arylidenecyanoacetates or arylidenepivaloylacetonitriles
Formal Asymmetric Cycloaddition of Activated α,β-Unsaturated Ketones with α-Diazomethylphosphonate Mediated by a Chiral Silver SPINOL Phosphate Catalyst
nonspiro-phosphonylpyrazolines via an asymmetric formal 1,3-dipolar cycloaddition reaction of α-diazomethylphosphonate with activated, acyclic α,β-unsaturatedketones, bearing an additional nitrile electron-withdrawing group, has been developed, utilizing an in situ generated chiral silver phosphate catalyst, affording excellent stereoselectivities (up to 98% ee, 99:1 dr) and yields (up to 95%). A stepwise
Convenient synthesis of hexasubstituted benzene derivatives via DABCO promoted domino reaction of arylidene malononitrile and dialkyl but-2-ynedioate
作者:Hui Zheng、Ying Han、Jing Sun、Chao-Guo Yan
DOI:10.1016/j.cclet.2020.12.024
日期:2021.5
A convenient synthetic protocol for the hexasubstituted benzene derivatives was successfully developed by DABCO promoted dominoreaction of arylidene malononitrile with two molecules of dialkyl but-2-ynedioates. The dominoreaction resulted in tetraalkyl 6-cyano-[1,1′-biphenyl]-2,3,4,5-tetracarboxylates in good to high yields. This formal [2 + 2 + 2] cycloaddition was believed to proceed with sequential
Three-component reaction of triphenylphosphine, dialkyl but-2-ynedioate and arylidene pivaloylacetonitrile for diastereoselective synthesis of densely substituted 2,3-dihydrofurans
作者:Wen-Jie Qi、Ying Han、Chang-Zhou Liu、Chao-Guo Yan
DOI:10.1016/j.cclet.2016.09.014
日期:2017.2
Abstract The three-component reaction of triphenylphosphine, dialkyl but-2-ynedioate and arylidene pivaloylacetonitrile in dry methylene dichloride at room temperature resulted in unexpected densely substituted 1-(triphenyl-λ 5 -phosphanylidene)ethyl)-2,3-dihydrofurans in satisfactory yields with high diastereoselectivity. The relative configuration of the 2,3-dihydrofurans was elucidated by determination