Catalytic Asymmetric Formal [4 + 1] Annulation Leading to Optically Active <i>cis</i>-Isoxazoline <i>N</i>-Oxides ShiZugui TanBin Wen Yi LeongWendy ZengXiaofei LuMin ZhongGuofu 2010 The catalytic asymmetric synthesis of densely functionalized <i>cis</i>-isoxazoline <i>N</i>-oxides was realized with novel use of an organocatalyst, (<i>S</i>)-2-(azidodiphenylmethyl)pyrrolidine (<b>4e</b>) (Tan, B.; Zhu, D.; Zhang, L.; Chua, P. J.; Zeng, X.; Zhong, G. <i>Chem.−Eur. J.</i> <b>2010</b>, <i>16</i>, 3842; Olivares-Romero, J. L.; Juaristi, E. <i>Tetrahedron</i> <b>2008</b>, <i>64</i>, 9992), via an elegant formal [4 + 1] annulation strategy using readily available 2-nitroacrylates and α-iodoaldehydes.