Efficient Synthesis of 2-Mono- and 2,5-Disubstituted Furans via the CuI-Catalyzed Cycloisomerization of Alkynyl Ketones
作者:Alexander V. Kel'i、Vladimir Gevorgyan
DOI:10.1021/jo010832v
日期:2002.1.1
A mild, general, and efficient method for the synthesis of 2-monosubstituted and 2,5-disubstitutedfurans via the CuI-catalyzed cycloisomerization of alkynyl ketones was developed. It was demonstrated that furans containing both acid- and base-labile groups could be easily synthesized using this methodology. A plausible mechanism for this transformation is proposed.
Organic synthesis using haloboration reactions 11. A formal carboboration reaction of 1-alkynes and its application to the di- and trisubstituted alkene synthesis
prepared by the bromoboration reaction of 1-alkynes with tribromoborane, proceeds in the presence of a palladium catalyst to give 2,2-disubstituted alkenylboranes, which can be used for the di- or tri-substituted alkenesynthesis directly.
A novel method for carbon-carbon bond formation palladium-catalyzed cross-coupling reaction of phenyl fluoroalkanesulfonates with organozinc reagents
作者:Qing-Yun Chen、Ya-Bo He
DOI:10.1016/s0040-4039(00)96131-8
日期:——
Cross-coupling reaction of phenyl fluoroalkanesulfonates with three kinds of organozinc reagents in the presence of palladium gives the corresponding alkylbenzenes in good yields. A possible mechanism is suggested.
Stereoselective Synthesis of (Z)-(1-Organo-1-alkenyl)boronic Esters by the Palladium-Catalyzed Cross-Coupling Reaction of (Z)-(1-Iodo-1-alkenyl)boronic Esters with Organozinc Reagents
作者:Tsukasa Moriya、Norio Miyaura、Akira Suzuki
DOI:10.1246/cl.1993.1429
日期:1993.8
pinacol ester of (Z)-(1-iodo-1-hexenyl)boronic acid in the presence of Pd(PPh3)4 proceeded with complete retention of the configuration of the starting boronate. The reaction provided (E)-(1-organo-1-hexenyl)boronic esters which were not available by the conventional hydroboration technique. The utility of the reaction was demonstrated by stereoselectivesynthesis of an exocyclic alkene via the cross-coupling
Several fluoroenynes have been prepared by palladium-catalyzed cross-coupling reactions. Cycloaddition reactions of these enynes give substituted cyclobutanes, whereas treatment with sulfuric acid leads to α-fluoro-α-allenic acid fluorides, lactones, α-fluoro-β-diketones or cyclic α-fluoroenones, according to the nature of the starting enyne. The cyclisation process is discussed.