An efficient and highly selective phosphine-free NN-manganese(I) complex catalyst system was developed for the acceptorless dehydrogenative coupling of alcohols with amines to form imines. The coupling reactions underwent at 3 mol % catalyst loading, and a large range of alcohols and amines with diverse functional groups was applied, including challenging diol and diamine. The target imine products were obtained in good to excellent yields. The present work provides an alternative method to construct highly active nonprecious metal complex catalysts based on phosphine-free ligands.

中文翻译：

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无磷条件下高选择性锰催化的亚胺的合成

开发了一种高效且高度选择性的无膦NN-锰（I）络合物催化剂体系，用于醇与胺的无受体脱氢偶联形成亚胺。偶联反应在催化剂负载量为3 mol％的条件下进行，应用了各种醇和具有不同官能团的胺，包括挑战性的二醇和二胺。以良好至优异的产率获得了目标亚胺产物。本工作提供了一种基于无膦配体的高活性非贵金属配合物催化剂的构建方法。