Cobalt-catalyzed asymmetric olefin aziridination with diphenylphosphoryl azide

The cobalt(II) complexes of D(2)-symmetric chiral porphyrins, such as 3,5-Di'Bu-ChenPhyrin P5, can catalyze asymmetric olefin aziridination with dipherylphosphoryl azide (DPPA) as a nitrene source. Acceptable asymmetric inductions were observed for the [Co(P5)]-based catalytic system, forming the desired N-phosphorus-substituted aziridines in moderate to high yields and good enantioselectivities.