A convenient one-pot procedure for the synthesis of β-amino ketones 5 from economical shelf reagents is described. Iminium salts 3 are generated in virtually quantitative yields from secondary amines 1 and aldehydes 2 mediated by NaI/Me3SiCl/NEt3. Subsequently, the salts 3 are used for the in situ aminoalkylation of enamines 4. The method provides the Mannich bases 5 in high yields and excellent diastereoselectivities (>96 % ds). It can also be applied for the aminoalkylation of other nucleophiles such as imines or electron-rich aromatic compounds.
描述了一种方便的一锅法合成β-
氨基酮5的方法,使用经济的现成试剂。从二级胺1和醛2在NaI/Me3SiCl/NEt3的介导下几乎定量地产生
亚胺盐3。随后,这些盐3用于在位
氨基烷基化烯胺4。该方法以高产率和优良的立体选择性(>96% ds)提供Mannich碱5。它还可以应用于其他亲核试剂的
氨基烷基化,如
亚胺或富电子芳香化合物。