Lewis acid catalyst system for Diels-Alder reaction

Ca(OTf)(2)/Bu4NPF6 catalytic system has been illustrated for the synthesis of Diels-Alder adduct for the first time. This procedure tolerates substrate diversity and delivers high yield. Use of environmentally benign catalyst, high yields and substrate diversity are the highlight of the existing method. Graphic Ca(OTf)(2), along with n-Bu4NPF6 as the co-catalyst, is shown to be an effective Lewis acidic catalyst system for the Diels-Alder reaction. Apart from being sustainable and efficient, this procedure is robust and products are obtained in near-quantitative yields.