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
Gold(I)-Catalyzed Desymmetrization of 1,4-Dienes by an Enantioselective Tandem Alkoxylation/Claisen Rearrangement
作者:Hongmiao Wu、Weiwei Zi、Guigen Li、Hongjian Lu、F. Dean Toste
DOI:10.1002/anie.201503357
日期:2015.7.13
An enantioselective alkoxylation/Claisen rearrangement reaction was achieved by a strategic desymmetrization of 1,4‐dienes under the catalysis of (S)‐DTBM‐Segphos(AuCl)2/AgBF4. This reaction system was highly selective for the formation of 3,3‐rearrangement products, providing cycloheptenes with various substitutions in good yield and good to excellent enantioselectivity. This transformation was further
Chemically Controlled Conductivity: Torsion-Angle Dependence in a Single-Molecule Biphenyldithiol Junction
作者:David Vonlanthen、Artem Mishchenko、Mark Elbing、Markus Neuburger、Thomas Wandlowski、Marcel Mayor
DOI:10.1002/anie.200903946
日期:2009.11.9
of the molecular conductance was observed in a series of eight biphenyldithiols with fixed torsion angles between the phenyl rings. These compounds were synthesized and their single‐molecule conductance was investigated in an STM junction. A cos2 dependence was found between the interplane torsion angle and the single‐molecule conductivity (see plot).