描述了广泛的钯催化的芳基和乙烯基卤化物和烯丙基乙酸酯的区域特异性和立体特异性的5-,6-和7-exo-dig单,双和三环化方法。单环和双环化过程终止于从哌啶甲酸或甲酸钠中捕获氢化物。Tl 2 CO 3的添加导致炔-丙二烯异构化,并且在环化之后导致1,3-二烯,这使Diels-Alder加合物具有良好的收率。
描述了广泛的钯催化的芳基和乙烯基卤化物和烯丙基乙酸酯的区域特异性和立体特异性的5-,6-和7-exo-dig单,双和三环化方法。单环和双环化过程终止于从哌啶甲酸或甲酸钠中捕获氢化物。Tl 2 CO 3的添加导致炔-丙二烯异构化,并且在环化之后导致1,3-二烯,这使Diels-Alder加合物具有良好的收率。
A new palladium catalysed-anion capture process is proposed, Examples are provided involving cyclisation of o-(ω-acetylenic)-aryl iodides and 2-bromo-1,6-enynes to heterocyclic- and carbocyclic-vinylpalladium species followed by hydride ion capture.
Catalytic four -step cascade cyclopropanations involving an intermolecular olefin insertion step are readly achieved. The processes may be terminated by β - hydride elimination or hydride ion capture and provide flexible new methodology for multiple CC bond formation.
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.
Palladium Catalysed Tandem Cyclisation–Anion Capture Processes. Part 4: Organotin(IV) Transfer Agents
作者:Paul Fretwell、Ronald Grigg、Jose M Sansano、Visuvanathar Sridharan、Sukanthini Sukirthalingam、David Wilson、James Redpath
DOI:10.1016/s0040-4020(00)00659-1
日期:2000.9
Palladium(0) catalysed cascade mono- and bis-cyclisation-anion capture involving a wide variety of starter species, terminating species and organotin(IV) anion capture reagents are reported leading to a range of bridged, fused and spirocyclic products. The diastereoselectivity of the bis-cyclisation processes is explained in terms of steric effects in the transition states. (C) 2000 Elsevier Science Ltd. All rights reserved.
Palladium catalysed cyclisation- intermolecular cyclopropanation versus cyclisation Friedel- Crafts alkylation with olefin insertion
Palladium catalysed cascade processes involving formation of two new rings and three new bonds with incorporation of norbornene are described. Factors influencing 3 - versus 5-membered rings are identified. (C) 1998 Elsevier Science Ltd. All rights reserved.