A convenient one-pot procedure for the highly diastereoselective synthesis of 1,3-diamines 4 from inexpensive starting materials is described. Enamines 2 are aminoalkylated with preformed ternary iminium salts 1 yielding exclusively the quaternary iminium salts 3. In situ reduction of 3 with NaBH4/MeOH provides a broad access to the diastereomerically pure 1,3-diamines 4 in moderate to good yields.
本文介绍了一种利用廉价的起始原料高非对映选择性合成 1,3-二胺 4 的便捷的单锅程序。烯胺 2 与预制的三元
亚胺盐 1
氨基烷基化后,只生成季
亚胺盐 3。用 NaBH4/MeOH 对 3 进行原位还原,可以广泛地获得非对映纯的 1,3-二胺 4,收率从中等到良好。