An enriching experience: Chiral phosphoric acids have been used to catalyze the title transformation for aromatic and aliphatic hemiaminal ethers. The process affords the corresponding products in good to high enantioselectivity (see scheme; Boc=tert‐butoxycarbonyl, G=aromatic group). The method enables facile access to highly enantioenriched 1,3‐diamine derivatives.

中文翻译：

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手性布朗斯台德酸激活半胱氨酸醚，以方便地利用烯草胺类化合物获得对映选择性两碳同系物

丰富的经验：手性磷酸已被用于催化芳香族和脂肪族半乳糖醚的标题转化。该方法可提供具有良好至高对映选择性的相应产物（参见方案； Boc =叔丁氧羰基，G =芳族基团）。该方法可以轻松获得高度对映体富集的1,3-二胺衍生物。