Controlling Selectivity for Cycloadditions of Nitrones and Alkenes Tethered by Benzimidazoles: Combining Experiment and Theory
作者:Liping Meng、Selina C. Wang、James C. Fettinger、Mark J. Kurth、Dean J. Tantillo
DOI:10.1002/ejoc.200801211
日期:2009.4
Herein we describe a combined experimental/theoretical study on the effects of substituents on regio- and stereoselectivity in intramolecular 1,3-dipolar cycloadditions of nitrones and alkenes tethered by benzimidazoles. By employing a large substituent at position R2 or R3, complete selectivity was achieved for either the fused or bridged cycloadduct, respectively. In addition, these cycloadducts
本文中,我们描述了结合的实验/理论研究,涉及取代基对苯并咪唑束缚的硝酮和烯烃的分子内1,3-偶极环加成反应中区域和立体选择性的影响。通过在位置R2或R3处使用大取代基,分别对稠合或桥接的环加合物实现了完全的选择性。另外,这些环加合物在所有检查的环加成物中均形成为单一非对映异构体。