Acknowledgement Financial support from National Natural Science Foundation of China (Nos. 21072100; 21121002; 21272119) is gratefully acknowledged.
in this work, the phosphine-catalyzed annulation reactions between modified allylic derivatives and polar 1,1-dicyano-1,3-dienes have been studied. In the catalysis of PPh3 (20 mol%), a [4 + 1 ] annulation reaction...