Preparation and Addition−Elimination Reactions of Benzyl α,β,β-Trifluoroacrylate. A New Stereoselective Approach to (<i>Z</i>)-β-Substituted α,β-Difluoroacrylates
Benzyl α,β,β-trifluoroacrylate (1) was prepared in good yield via the reductive Br−F elimination of benzyl 2-bromo-2,3,3,3-tetrafluoropropanoate or the palladium-catalyzed cross-coupling reaction of 1,2,2-trifluorovinylstannane with benzyl chloroformate. On treating 1 with various Grignard reagents or dialkylzinc reagents in the presence of copper(I) salt, the corresponding β-substituted α,β-difluoroacrylates
4-AMINO-6-(HALO-SUBSTITUTED-ALKYL)-PICOLINATES AND THEIR USE AS HERBICIDES
申请人:Dow AgroSciences LLC
公开号:US20150164074A1
公开(公告)日:2015-06-18
Provided herein are 4-amino-6-(halo-substituted-alkyl)-picolinic acids and their derivatives, compositions comprising the acids and their derivatives, and methods of use thereof as herbicides.
trifluoromethanesulfonate induces a twofold intramolecular condensation providing an efficient access to 4,4′′‐di‐ and 4,4′,4′′‐trifunctionalized 6,6′′‐dimethyl‐2,2′:6′,2′′‐terpyridines. Using this method, hitherto unknown 4,4′′‐bis(dimethylamino)‐ and 4,4′,4′′‐tris(dimethylamino)terpyridines have been prepared that show remarkably high calculated Lewis basicities.
Sulfur Extrusion with Tin Radical: Synthesis of 4‘,5‘-Didehydro-5‘-deoxy-5‘-(tributylstannyl)adenosine, an Intermediate for Potential Inhibitors against <i>S</i>-Adenosyl Homocysteine Hydrolase
作者:Hiroki Kumamoto、Sayoko Onuma、Hiromichi Tanaka
DOI:10.1021/jo030256y
日期:2004.1.1
of vinyl fluoride. Because of the susceptibility of 12 to protodestannylation, the (Z)-vinyl iodide (13), prepared in quantitative yield from 12, was used as a substrate for C−C bond formation. Various types of carbon substituents (phenyl, vinyl, trifluorovinyl, ethynyl, and cyano) were introduced to the 5‘-position of the 5-deoxy-β-d-erythro-pent-4-enofuranosyl structure to open up a new route to
Three-Component Synthesis of Perfluoroalkyl- or Perfluoroaryl-Substituted 4-Hydroxypyridine Derivatives and Their Palladium-Catalyzed Coupling Reactions
couplings. Suzuki reactions at C-4 and C-3 of the pyridine ring proceeded with moderate to high yields. In addition, Suzuki−Miyaura, Stille, or Buchwald−Hartwig couplingreactions have also been studied and afforded the corresponding highly substituted pyridine derivatives. Starting from an arylated propargylic ether the three-componentreaction led to a pentasubstituted 4-hydroxypyridine derivative that