Silylstannylation of Allenes and Silylstannylation−Cyclization of Allenynes. Synthesis of Highly Functionalized Allylstannanes and Carbocyclic and Heterocyclic Compounds
作者:Ramaiah Kumareswaran、Seunghoon Shin、Isabelle Gallou、T. V. RajanBabu
DOI:10.1021/jo049010z
日期:2004.10.1
silicon−tin reagents to undergo the cyclization illustrate the scope and limitations of the reaction. Based on the isolation of intermediates, a mechanism for the formation of the cyclic compounds is proposed. Model transition states to explain the stereoselectivity in cyclization of substituted allenynes are provided. Further elaboration using the vinyltin and vinylsilane moieties should lead to highly functionalized
Regio- and Stereochemical Control in Bis-functionalization−Cyclization: Use of Alleneyne Precursors for Carbocyclic and Heterocyclic Synthesis
作者:Seunghoon Shin、T. V. RajanBabu
DOI:10.1021/ja011281t
日期:2001.8.1
Gold-Catalyzed <i>N</i>,<i>O</i>-Functionalizations of 6-Allenyl-1-ynes with <i>N</i>-Hydroxyanilines To Construct Benzo[<i>b</i>]-azepin-4-one Cores
作者:Antony Sekar Kulandai Raj、Balaji S. Kale、Bhanudas Dattatray Mokar、Rai-Shung Liu
DOI:10.1021/acs.orglett.7b02629
日期:2017.10.6
Gold-catalyzedreactions of 6-allen-1-ynes with N-hydroxyanilines afford thermally stable benzoazepin-4-ones in anti-selectivity; these anti-configured products are easily isomerized to their syn-isomers on a silica column. The mechanism of reactions likely involve initial nitrone/allene cycloadditions, followed by skeletal rearrangement of resulting intermediates.