Alkyl- and π-allyl-palladium species arising from 5-exo-trig cyclisations onto proximate alkenes or dienes can be intercepted by hydride ion sources leading to carbo- and hetero-cyclic compounds usually in good yield.
Palladium catalysed tandem cyclisation-anion capture processes. Part 3. Organoboron anion transfer agents
作者:Ronald Grigg、JoséM. Sansano、Vijayaratnam Santhakumar、Visuvanathar Sridharan、Ravishanker Thangavelanthum、Mark Thornton-Pett、David Wilson
DOI:10.1016/s0040-4020(97)00754-0
日期:1997.8
The cyclisation-anion capture protocol has been applied to a wide range of starter and terminating species to effect regio-and stereo-specific mono-and bis-cyclisation processes in which a variety of organoboronderivatives function as anion transfer reagents. Direct capture (no cyclisation) is rarely a problem and it can usually be suppressed by modification of the reaction conditions. (C) 1997 Elsevier Science Ltd.