284049-37-2Relevant articles and documents
Organocatalytic formal [2+2] cycloaddition initiated by vinylogous Friedel-Crafts alkylation: Enantioselective synthesis of substituted cyclobutane derivatives
Duan, Guo-Jian,Ling, Jun-Bing,Wang, Wei-Ping,Luo, Yong-Chun,Xu, Peng-Fei
supporting information, p. 4625 - 4627 (2013/06/05)
An organocatalytic vinylogous Friedel-Crafts alkylation-initiated formal [2+2] cycloaddition was successfully developed based on tandem iminium-enamine activation of enals. Transformable pyrrole-functionalized cyclobutanes with three contiguous stereocenters were readily obtained with excellent levels of regio-, diastereo- and enantiocontrol. The Royal Society of Chemistry 2013.
Organoyttrium-catalyzed sequential cyclization/silylation reactions of nitrogen-heteroaromatic dienes demonstrating 'aryl-directed' regioselectivity
Molander, Gary A.,Schmitt, Monika H.
, p. 3767 - 3770 (2007/10/03)
The reaction of 1-allyl-2-vinyl-1H-pyrroles and 1-allyl-2-vinyl-1H- indoles with arylsilanes in the presence of catalytic [Cp(TMS)2Y(μ-Me)]2 leads to highly selective cyclization/silylation events. In this process the active catalyst for the reaction, 'Cp(TMS)2YH', undergoes initial olefin insertion at the vinyl group. Even isopropenyl substituents on the heteroaromatics react in preference to less sterically encumbered allyl groups. Furthermore, the observed regioselectivity reflects an 'aryl- directed' process, whereby the more highly substituted secondary or tertiary organometallic is initially generated. This intermediate undergoes cyclization onto the remaining alkene and subsequent silylation by a σ-bond metathesis reaction, affording the observed products.