Synthesis of 2-(1-Phenylvinyl)benzofurans and 2-(1-Phenylvinyl)indoles as Antimitotic Agents by a Tandem Palladium-Assisted Coupling-Cyclization Reaction between 1-Phenylvinyl Iodides and ortho-Substituted Arylalkynes

[摘要]：A series of functionalized 2-(1-phenylvinyl)benzofurans 2 and 2-(1-phenylvinyl)indoles 3 were prepared from 1-phenylvinyl iodides and silylated alkynes in a one-pot reaction. After a desilylation step, the Sonogashira coupling reaction between the resulting terminal alkynes and 1-phenylvinyl iodide derivatives 6 gave enyne intermediates, which underwent a 5-endo-dig cyclization to afford 2-(1-phenylvinyl) heterocycles 2 and 3 in good yields. This method provides a rapid and efficient approach to build up benzoheterocycle-based isocombretastatin A-4 analogues of biological interest. From this series of compounds, the indoles 3o and 3r inhibited tubulin assembly at a micromolar level comparable to that of isoCA-4.

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