Asymmetric Synthesis of (<i>S</i>)-3-Amino-4-methoxy-butan-1-ol by Way of Reductive Amination
作者:Patrizio Mattei、Gérard Moine、Kurt Püntener、Rudolf Schmid
DOI:10.1021/op1002775
日期:2011.3.18
A new synthesis of (S)-3-amino-4-methoxy-butan-1-ol is reported. The synthesis is based on the preparation of the primary, nonprotected enamine of the commercially available β-keto ester methyl 4-methoxy-3-oxo-butanoate and asymmetric catalytic enamine hydrogenation using a Ru-MeOBIPHEP catalyst. Alternatively, the process is performed by asymmetric catalytic reductive amination of the β-keto ester
报道了(S)-3-氨基-4-甲氧基-丁-1-醇的新合成。该合成是基于制备可商购的β-酮酯4-甲氧基-3-氧代丁酸甲酯的伯胺,未保护的烯胺和使用Ru-MeOBIPHEP催化剂进行不对称催化烯胺加氢。或者,该方法通过使用类似的Ru催化剂通过β-酮酯与乙酸铵和氢的不对称催化还原胺化来进行。两种工艺版本均提供了97-98%的初始ee值,通过产品结晶可将其提高到≥99%。氨基的短暂Boc保护后,通过LiBH 4还原可以最好地实现酯到醇的转化。