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A Copper‐Catalyzed Domino Reaction of Alkynyl Bromides and Oxazolidine‐2‐thiones: Synthesis of Thiazol‐2‐ones
10.1002/ajoc.201800154 2018-04-14 A copper‐catalyzed cyclization of alkynyl bromides and oxazolidine‐2‐thiones is described. C−N and C−S bonds are simultaneously constructed and a multi‐step process occurred to give the five‐member heterocycles of thiazol‐2‐ones containing 2‐alkylthio‐oxazoli... |
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Sequential Ytterbium(III) Triflate Catalyzed One‐Pot Three‐Component Thia‐Michael Addition
10.1002/ajoc.201800087 2018-04-10 A ytterbium(III) trifluoromethanesulfonate catalyzed one‐pot three‐component thia‐Michael addition reaction of thiolate salts, organic halides, and α,β‐unsaturated compounds has been developed for the formation of carbon‐sulfur bonds. In this study, potassium... |
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Recent Progress in Using Pyrene‐4,5‐diketones and Pyrene‐4,5,9,10‐tetraketones as Building Blocks to Construct Large Acenes and Heteroacenes
10.1002/ajoc.201800039 2018-04-10 Acenes, usually defined as segments of “graphene”, consist of linearly annulated benzene rings, and have attracted considerable interest in both theoretical research and practical applications. However, these compounds generally have undesirable features such... |
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Chelation‐assisted β‐selective direct C‐H bond arylation of 2‐thienylthioamide catalyzed by Pd‐1,10‐phenanthroline complexes
10.1002/ajoc.201800160 2018-04-06 Palladium‐1,10‐phenanthroline‐catalyzed chelation‐assisted direct C‐H bond arylation of thienylthioamide was developed. The base used critically affected the reactivity, and β‐selective (3‐selective) reaction took place with K2CO3, and both α and β‐positions ... |
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Radical Reaction for the Synthesis of Thiopyrans under Photosensitized Condition
10.1002/ajoc.201800159 2018-04-06 We report the synthesis of thiopyran derivatives under photosensitized conditions. This method arouses the interest from the viewpoint of the reaction mechanism and is a novel synthetic route for heterocycles. |
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Light‐Induced Cyclization of A [c2]Daisy‐Chain Rotaxane to Form a Shrinkable Double‐Lasso Macrocycle
10.1002/ajoc.201800114 2018-04-06 A pH‐responsive double‐lasso macrocycle has been successfully obtained directly from a [c2]daisy chain rotaxane via a photodimerization reaction of two terminal coumarin ligands. The size of the double‐lasso macrocycle could be tuned by acid/base stimuli with... |
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An Efficient Synthesis of exo/endo‐Hydroxylated Cyclohexenones by Thiol/Amine‐Mediated Tandem Aldol–[2,3]‐Sigmatropic Rearrangement: Amine‐Dependent Complementary Regioselectivity
10.1002/ajoc.201800081 2018-04-06 exo/endo‐Hydroxylated cyclohexenones are essential synthetic intermediates for a variety of biologically active compounds. However, methods that lead to efficient and selective preparation of exo/endo‐hydroxylated cyclohexenones remain to be established. Here... |
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Fabrication of Ionic‐Liquid‐Embedded ZnO Nanoparticles: Application of a Synergistic Catalytic Effect to Thiol‐Induced 2‐Pyridone Synthesis
10.1002/ajoc.201700610 2018-04-06 This is the first report of thiol‐induced, recyclable ZnO–[2COOHMIM]+Br−‐catalysed (2COOHMIM=1‐(2‐carboxyethyl)‐3‐methylimidazolium), water‐mediated 2‐pyridone synthesis by two new straightforward strategies with 37 examples. This catalytic system was prepare... |
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Cobalt/N, N', N''‐Trihydroxyisocyanuric Acid (THICA)‐Catalyzed Aerobic Oxidative Esterification and Amidation of Aldehydes
10.1002/ajoc.201800118 2018-03-26 A system of Co(II)/N, N', N''‐trihydroxyisocyanuric acid (THICA)‐catalyzed aerobic oxidative esterification and amidation of aldehydes has been developed in this work. Preliminary insight of the mechanism indicates such an oxidative C−O/N cross‐coupling proce... |
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Salicylate‐Directed C‐O Bond Cleavage: Iron‐Catalyzed Allylic Substitution with Grignard Reagents
10.1002/ajoc.201800057 2018-03-25 Selective C‐O bond cleavage is of high interest for modern organic synthesis. A strategy for selective allylic C‐O bond cleavage using ethyl salicylate as a directing leaving group has been developed. The reaction is initiated by the chelation of the ortho‐es... |