Solvent influence in the Rh-catalyzed intramolecular 1,6 C–H insertions: a general approach to the chromane and flavanone skeletons
作者:Antonio Rosales、Ignacio Rodríguez-García、Cristóbal López-Sánchez、Míriam Álvarez-Corral、Manuel Muñoz-Dorado
DOI:10.1016/j.tet.2011.03.004
日期:2011.4
Solvent polarity and nature of the ligands on the catalyst are crucial factors that control the regioselectivity of the Rh(II) promoted intramolecular 1,6 C-H insertions versus the 3-elimination. We have explored the best conditions for the preparation of flavanones and chromenes through this approach. The procedure is also an excellent way of preparing stereochemically pure Z aryl-alkenes. (C) 2011 Elsevier Ltd. All rights reserved.