Studies of the Generation and Pericyclic Behavior of Cyclic Pentadienyl Carbanions. Alkylation Reactions as an Efficient Route to Functionalized <i>cis</i>-Bicyclo[3.3.0]octenes
作者:David R. Williams、Jonathan T. Reeves、Partha P. Nag、William H. Pitcock、Mu-Hyun Baik
DOI:10.1021/ja063243l
日期:2006.9.1
anions display unique reactivity, depending on ring size. Cyclooctadienyl anions readily undergo disrotatory electrocyclization to cis-bicyclo[3.3.0]octenyl systems, which are trapped with a variety of electrophiles to stereoselectively provide functionalized cis-bicyclo[3.3.0]octenes. The carbolithiation and electrocyclization processes are examined using low-temperature (1)H NMR experiments. An expedient