Enantioselective Organocatalytic Conjugate Addition of Nitroalkanes to Electrophilic 2-Iminochromenes

We disclose a new efficient enantioselective organocatalytic conjugate addition method for the preparation of 2-amino-4<i>H</i>-chromenes in high to excellent yields (75–95%) and with high to excellent enantioselectivities (86–97% ee). It is noteworthy that the 2-iminochromene was first disclosed as an active electrophile