6214-22-8Relevant academic research and scientific papers
New carbocyclic nucleosides: Synthesis of carbocyclic pseudoisocytidine and its analogs
Maier, Luká?,Hylse, Ond?ej,Ne?as, Marek,Trbu?ek, Martin,Ytre-Arne, Mari,Dalhus, Bj?rn,Bjor?s, Magnar,Paruch, Kamil
supporting information, p. 3713 - 3716 (2014/06/23)
Cyclopentane-containing nucleoside analogs with a CC connection between the (heterocyclic) base and the carbocyclic scaffold are quite rare. Herein, we report the synthesis of previously unknown racemic carbocyclic pseudoisocytidine and its analogs, which
A new stereocontrolled synthesis of dihydroxerulin, a potent noncytotoxic inhibitor of the biosynthesis of cholesterol
Rossi, Renzo,Bellina, Fabio,Catanese, Antonella,Mannina, Luisa,Valensin, Daniela
, p. 479 - 487 (2007/10/03)
Dihydroxerulin, 1, has been stereoselectively synthesized by a convergent approach in which a key step was the Wittig reaction between (Z)- 5-[(E)-3-formyl-2-propenylidene]-5H-furan-2-one, 15, and the phosphonium ylid which derived from [(E)-2-decen-4,6-diyn-1-yl]triphenylphosphonium bromide, 19. Compound 19 was conveniently prepared by a short reaction sequence involving a Stille reaction between 1-trimethylstannyl-1,3-heptadiyne, 17, and (E)-3-iodo-2-propen-1-ol, 18. On the other hand, compound 15 was prepared in eight steps by a reaction sequence in which an immediate precursor to this butenolide, i.e. (Z)-5-[(2E)-4-hydroxy-2-butenylidene]-5H-furan-2-one, 34, was regio- and stereoselectively synthesized by Ag(I)-catalysed lactonization of the corresponding (Z)-2-en-4-ynoic acid. The structure and stereochemistry of 1 were established on the basis of its 1H and 13C NMR spectra at 600 and 150 MHz, respectively, and by a combination of 2D NMR techniques. (C) 2000 Elsevier Science Ltd.
A Novel Regio- and Stereospecific Hydrohalogenation Reaction of 2-Propynoic Acid and Its Derivatives
Ma, Shengming,Lu, Xiyan,Li, Zhigang
, p. 709 - 713 (2007/10/02)
2-Propynoic acid and its derivatives are hydrohalogenated regio- and stereospecifically by reaction with lithium halides in acetic acid, or preferably with 1 equiv of acetic acid in refluxing CH3CN, to afford the thermodynamically unfavorable (Z)-3-halopropenoic acids and their derivatives as sole products.A rationale for the regio- and stereospecifity is briefly discussed.
Palladium-Catalyzed Triethylammonium Formate Reductions. 4. Reduction of Acetylenes to Cis Monoenes and Hydrogenolysis of Tertiary Allylic Amines
Weir, John R.,Patel, Babu A.,Heck, Richard F.
, p. 4926 - 4931 (2007/10/02)
Eight phenyl-conjugated and double bond conjugated acetylenes were reduced with triethylammonium formate and a palladium on carbon catalyst.Cis olefins were obtained in good yields in five examples. 4-Nitrodiphenylacetylene gave only 4-aminodibenzyl and (Z)-methyl non-2-en-4-ynoate gave mainly the E,Z dienoate. 1-Phenyl-3-methylbut-3-en-1-yne gave the cis diene initially, but it isomerized partially under the reaction conditions.Five tertiary allylic amines were shown to undergo hydrogenolysis with the same reducing agent and catalyst to give mixtures of two isomeric olefins in moderate to good yields.
