A Novel Asymmetric Synthesis of 3-(1H-Pyrrol-1-yl)-Substituted β-Lactams via a Bismuth Nitrate-Catalyzed Reaction
作者:Aarif L. Shaikh、Bimal K. Banik
DOI:10.1002/hlca.201100202
日期:2012.5
The reaction of racemic α‐keto β‐lactams 5a–5c with the commercially available chiral compound trans‐4‐hydroxy‐L‐proline (6) in the presence of a catalytic amount of Bi(NO3)3⋅5 H2O in EtOH gave a diastereoisomer mixture of β‐lactams with a pyrrole ring at C(3) (7 to 12). This is the first enantioselective synthesis of optically active β‐lactams (=azetidin‐2‐ones) that possess a pyrrolyl residue at
的反应外消旋α酮β内酰胺5A - 5c中与市售的手性化合物的反式-4-羟基-大号-脯氨酸(6中的Bi催化量的存在下)(NO 3)3 ⋅5ħ 2 ö在EtOH中得到C-(3)(7至12)处带有吡咯环的β-内酰胺的非对映异构体混合物。这是一步就可以对映的,具有C(3)上吡咯基残基的旋光性β-内酰胺(=氮杂环丁烷-2-酮)的第一个对映体选择性合成方法。