Cobalt II(l-phenylalanine)₂ was used effectively for the first time in a catalytic asymmetric 1,3-dipolar cycloaddition of azomethine ylides with 2-arylidenindane-1,3-diones, affording a series of novel spiropyrrolidine derivatives with good to high yields (up to 90%), excellent diastereoselectivities (only exo’-3 were detected), and good enantioselectivities (up to 87% ee).

中文翻译：

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Co ^II /氨基酸配合物催化偶氮甲亚胺和2-芳基茚满-1,3-二酮的不对称1,3-偶极环加成反应，合成螺环-1,3-二酮-吡咯烷酮

钴II（1-苯丙氨酸）₂首次有效地用于偶氮甲亚胺与2-arylidenindane-1,3-diones的催化不对称1,3-偶极环加成反应，提供了一系列新颖的螺吡咯烷衍生物产率（高达90％），出色的非对映选择性（仅检测到exo'- 3）和良好的对映选择性（高达87％ee）。