Palladium catalysed queuing processes. Part 1: Termolecular cyclization–anion capture employing carbon monoxide as a relay switch and hydride, organotin(IV) or boron reagents
作者:Stephen Brown、Stephen Clarkson、Ronald Grigg、W.Anthony Thomas、Visuvanathar Sridharan、D.M Wilson
DOI:10.1016/s0040-4020(00)01103-0
日期:2001.2
enhance the scope of our cyclization–anion capture methodology, is introduced and exemplified by a wide variety of catalytic cyclization–carbonylation–anion capture processes employing hydride, organostannanes and NaBPh4 as anion capture agents. Mono- and bis-cyclization processes forming 5- and 6-membered rings are described, all of which employ CO at atmospheric pressure. Cyclocarboformylation processes
Palladium catalysed tandem cyclisation–anion capture. Part 7: Synthesis of derivatives of α-amino esters, nitrogen heterocycles and β-aryl/heteroaryl ethylamines via in situ generated vinylstannanes
作者:Adele Casaschi、Ronald Grigg、J.M Sansano
DOI:10.1016/s0040-4020(00)01030-9
日期:2001.1
terminal alkynes containing a β-N atom affords mainly α-vinylstannanes which serve as anion capture agents in palladium catalysed cyclisation–anion capture processes leading to derivatives of α-amino esters, nitrogen heterocycles and β-aryl/heteroaryl ethylamines in good yield.
Three component palladium catalysed cyclisation-carbonylation-anion capture processes
作者:Ronald Grigg、James Redpath、Visuvanathar Sridharan、David Wilson
DOI:10.1016/s0040-4039(00)73376-4
日期:1994.6
A series of palladiumcatalysed three component cyclisation-carbonylation-anion capture processes involving aryl iodides, carbon monoxide (1 atm) and Sn(IV)R or B(III)R reagents are reported. The stereo- and regio-specific cascade processes furnish tetrasubstituted carbon centres and fused- and spirocyclic-rings in excellent yield.
作者:Ronald Grigg、Martin F Jones、Michelle McTiernan、Visuvanathar Sridharan
DOI:10.1016/s0040-4020(01)00772-4
日期:2001.9
generation of azomethine ylides, from secondary acyclic and cyclicα-aminoacids, and their 1,3-dipolar cycloaddition, with regioselective palladium catalysed hydrostannylation of terminal alkynes, and subsequent cyclisation-anion capture of the organostannane is described. A major increase in molecular complexity results with the formation of 5 bonds, 5 stereocentres, 2 rings and 1 tetra-substituted carbon
Palladium catalysed tandem cyclisation–anion capture processes. Part 8 : In situ and preformed organostannanes. Carbamyl chlorides and other starter species
作者:Usman Anwar、Mark R. Fielding、Ronald Grigg、Visuvanathar Sridharan、Christopher J. Urch
DOI:10.1016/j.jorganchem.2005.11.045
日期:2006.4
A sequential one-pot process is reported involving in situ, palladium catalysed, formation of a series of tributylstannyl-1,2-carbo and heterocyclic dialkylidene-5-membered rings from the corresponding 1,6-diynes and Bu3SnH. These substrates and other organostannanes are then combined with carbamyl chlorides and iodobenzenes containing proximate alkene and alkynyl groups in palladium catalysed cyclisation-anion capture cascades affording a diverse range of heterocycles in good yield. (c) 2005 Elsevier B.V. All rights reserved.