Studies on Acetylenic Compounds. LII. Reactions of Acetylenic Sulfonium Salts with Cyclohexanone and Cyclopentanone
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چکیده
منابع مشابه
Hetero-Diels-Alder reactions of hetaryl-thiochalcones with acetylenic dienophiles
Hetaryl-substituted thiochalcones react with acetylenic monoand diesters in the THF solution in the presence of LiClO4 at 65°C to give, after 24h, 4H-thiopyran carboxylates and dicarboxylates, respectively, in moderate to good yields. The same reactions were performed also in the THF solution without a catalyst under microwave irradiation. In that case, the reaction time was reduced to three mi...
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Photochemically, covalent cycloaddition products of flavoquinone and acetylenic enzyme inhibitors have been prepared and elucidated, which appear analogous to flavoprotein-inhibitor complexes (monoamine and lactate oxidase). The additions occur with inhibitors of general type H C = C — C H < at the C (4a )=N(5 ) azomethine grouping of oxidized flavin. The spectral properties of adducts and thei...
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A novel method to prepare redox monolayers on silicon electrodes has been developed that employs Cu(I)-catalyzed oxidative acetylenic coupling reactions for molecular electronic type applications. As the first case study, ethynylferrocene was covalently immobilized onto an acetylene-terminated monolayer on a Si(100) surface to give a 1,3-diyne (C≡C-C≡C-) linked redox assembly. The derivatizatio...
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The discovery and development of an efficient ene carbocyclization of 1,3-dicarbonyl compounds bearing pendent terminal alkyne substituents under 3-nitrobenzeneboronic acid catalysis is described. The reaction is efficient, easy to perform and general to a wide range of ketoester substrates.
متن کاملNew acetylenic norlignan compounds from rhizomes of Curculigo crassifolia.
Two pairs of diastereoisomeric acetylenic norlignan compounds with PhCH(OR(1))CH(OR(2))CH(2)C triple bond CPh skeleta: (1R, 2R)-1-O-methylnyasicoside (1) and (1S, 2R)-1-O-methylnyasicoside (2), and (1R, 2R)-crassifogenin D (3) and (1S, 2R)- crassifogenin D (4), were isolated from the ethanolic extract of rhizomes of Curculigo crassifolia. Compounds 3 and 4 are new and their structures were eluc...
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1970
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.18.991