Polarizing the Nazarov Cyclization: The Impact of Dienone Substitution Pattern on Reactivity and Selectivity
作者:Wei He、Ildiko R. Herrick、Tulay A. Atesin、Patrick A. Caruana、Colleen A. Kellenberger、Alison J. Frontier
DOI:10.1021/ja077162g
日期:2008.1.1
The impact of dienone substitution on the Nazarovcyclization has been examined in detail. Substrates bearing different substituents at each of four positions on the dienone backbone were systematically probed in order to identify trends leading to higher reactivity and better selectivity. Desymmetrization of the pentadienyl cation and oxyallyl cation intermediates through placement of polarizing groups