[EN] PYRAZOLINE COMPOUND, PHOTOSENSITIVE RESIN COMPOSITION, AND PATTERNING METHOD [FR] COMPOSÉ DE PYRAZOLINE, COMPOSITION DE RÉSINE PHOTOSENSIBLE ET PROCÉDÉ DE FORMATION DE MOTIFS [ZH] 一种吡唑啉类化合物、感光性树脂组合物及图形化方法
Highly Enantioselective Synthesis of Spiro[cyclohexanone-oxindoles] and Spiro[cyclohexanone-pyrazolones] by Asymmetric Cascade [5+1] Double Michael Reactions
作者:Bin Wu、Jian Chen、Mei-Qiu Li、Jin-Xin Zhang、Xiao-Ping Xu、Shun-Jun Ji、Xing-Wang Wang
DOI:10.1002/ejoc.201101529
日期:2012.3
The asymmetric catalytic synthesis of naturally occurring and biologically active spiro compounds is a challenge for modern chemical methodology. Here we report the construction of spiro compounds through cascade [5+1] double Michael reactions between divinyl ketones and N-unprotectedoxindoles or N-phenyl-protected pyrazolones catalyzed by a combination of the easily available 9-amino-9-deoxy-epi-quinine
Synthesis of tetrasubstituted 1H-indazolo[1,2-b]phthalazinedione derivatives bearing three-dimensional turbine-type structures via domino reaction of phthalhydrazide and vinylketones
作者:Ya-Lun Xu、Ji-Ya Fu、Chun-Hui Liu、Tao Ding
DOI:10.1039/c7ra06856e
日期:——
A domino reaction of phthalhydrazide and vinylketone in the presence of phosphotungstic acid was successfully established, and 3D turbine-type tetrasubstituted 1H-indazolo[1,2-b]phthalazinedione derivatives were conveniently obtained with moderate to excellent yields (up to 95%). The highly efficient catalytic system exhibited broad substrate scopes under mild conditions. A 78% yield of the desired
成功地建立了在磷钨酸存在下的邻苯二甲酰肼和乙烯基酮的多米诺反应,并以中等至优异的收率(高达95%)方便地获得了3D涡轮型四取代的1 H-吲哚并[1,2- b ]酞嗪二酮衍生物。 。高效的催化体系在温和的条件下具有广阔的底物范围。当反应在几克规模下进行时,获得了所需产物的78%的收率。
Synthesis of Optically Enriched Spirocyclic Benzofuran-2-ones by Bifunctional Thiourea-Base Catalyzed Double-Michael Addition of Benzofuran-2-ones to Dienones
A highly enantioselective catalytic double‐Michael addition reaction of substituted benzofuran‐2‐ones with divinyl ketones promoted by readily accessible tertiary amine–thiourea Cinchona alkaloids has been developed. A number of opticallyenrichedspirocyclic benzofuran‐2‐ones were prepared in very good yields (up to 99 %), diastereoselectivities (up to 19:1 d.r.), and very good enantioselectivities
Double Michael addition of nitromethane to divinyl ketones: A remarkably positive effect of additive
作者:Yongqi Yao、Yingying Liu、Ling Ye、Feng Chen、Xinying Li、Zhigang Zhao、Xuefeng Li
DOI:10.1016/j.tet.2017.03.018
日期:2017.4
An efficient double Michaeladdition of nitromethane to divinyl ketones was established in good to high yields (75–99%). A wide range of cyclohexanones were obtained with excellent diastereocontrol (up to >20:1 dr) and enantioinduction (91–99% ee) in a one-pot fashion. The involvement of basic additive significantly enhanced the reactivity of this cascade sequence.