Catalytic oxidative functionalization of alkynes has emerged as an effective method in synthetic chemistry in recent decades. However, enantioselective transformations via metal carbene intermediates are quite rare due to the lack of robust chiral catalysts, especially in the intermolecular versions. Herein, we report the first asymmetric three-component reaction of commercially available alkynes with nitrones and alcohols, which affords α-alkoxy-β-amino-ketones in good yields with high to excellent enantioselectivity using combined catalysis by an achiral gold complex and a chiral spiro phosphoric acid (CPA). Mechanistically, this atom-economic reaction involves a catalytic alkyne oxidation/ylide formation/Mannich-type addition sequence that uses nitrone as the oxidant and the leaving fragment imine as the electrophile, providing a novel method for multi-functionalization of commercially available terminal alkynes.

中文翻译：

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末端炔烃与硝酮和醇的对映选择性氧化多功能化用于手性α-烷氧基-β-氨基-酮的快速组装

近几十年来，炔烃的催化氧化功能化已成为合成化学中的一种有效方法。然而，由于缺乏强大的手性催化剂，特别是在分子间版本中，通过金属卡宾中间体进行的对映选择性转化非常罕见。在此，我们报告了第一个市售炔烃与硝酮和醇的不对称三组分反应，该反应通过非手性金配合物和手性金配合物的联合催化，以良好的收率和高至优异的对映选择性得到 α-烷氧基-β-氨基酮。螺磷酸（CPA）。从机制上讲，这种原子经济反应涉及催化炔氧化/叶立德形成/曼尼希型加成序列，该序列使用硝酮作为氧化剂，离开片段亚胺作为亲电子试剂，