Chem. sci. Chem. sci. Racemic hemiacetals as oxygen-centered pronucleophiles triggering cascade 1, 4-addition/Michael reaction through dynamic kinetic resolution under iminium catalysis. Development and mechanistic insights Orue A. Uria U. Roca-López D. Delso I. Universidad de Zaragoza Reyes E. Carrillo L. Merino P. Universidad de Zaragoza Vicario J. L. 2017 research-article