Mild and Efficient Aryl−Alkenyl Coupling via Pd(II) Catalysis in the Presence of Oxygen or Cu(II) Oxidants
作者:Jay P. Parrish、Young Chun Jung、Seung Il Shin、Kyung Woon Jung
DOI:10.1021/jo020159p
日期:2002.10.1
We report herein a mild and efficient method for carbon-carbon bond formation between aryl stannanes and olefins via Pd(II) catalysis in the presence of oxygen or Cu(II) oxidants as a reoxidant. The process allows reactions between various olefins and aryl stannanes of varying electron density. Coupling methods under these oxidation conditions are comparatively described, and the benefits and limitations are also discussed.
Regiochemical aspects of intramolecular cycloadditions of nitrones derived from N-(2-alkenyl)-2-pyrrolecarbaldehydes. Competitive entries to pyrrolizidine and indolizidine derivatives
作者:Gianluigi Broggini、Concetta La Rosa、Tullio Pilati、Alberto Terraneo、Gaetano Zecchi
DOI:10.1016/s0040-4020(01)00785-2
日期:2001.9
Intramolecularcycloadditions of unsaturated nitrones derived from a series of N-(2-alkenyl)-2-pyrrolecarbaldehydes (2) have been systematically studied. A pronounced substituent effect has been observed as far as the competitive formation of fused- and bridged-ring regioisomers are concerned. Further elaboration of the two kinds of cycloadducts has given pyrrolizidine and indolizidine derivatives