Altering the electronics of R 2 had no effect on product selectivity. Both electron-withdrawing and donating substituents (e.g. CN in 2c, Me in 2d) furnished the [3,9]-aziridine in 75% (3d) and 68% (3c) yields, respectively. The consistent product outcome suggested that neither R 1 nor R 2 engages in NCIs with the carbamate group to influence the preferred formation of the [3,9]-aziridine product.