Second phase catalyst screening revealed the introduction of cycloalkyl groups to the 3,3' aryl units improved enantioselectivity while remaining synthetically tractable. c-Pent derivative 10 20 was found to be equivalent to i-Pr catalyst 3 (entry 8); however, c-Hex catalyst 11 (TCYP), and c-Hept catalyst 12 (entry 10) provided marked improvement, with 11 subsequently offering excellent reactivity and selectivity at 5 mol% loading and equistoichiometric PhNH2 in 2-MeTHF (entry 11).