Enantioselective Addition of Bromonitromethane to Aliphatic <i>N</i>-Boc Aldimines Using a Homogeneous Bifunctional Chiral Organocatalyst
作者:Kenneth E. Schwieter、Jeffrey N. Johnston
DOI:10.1021/acscatal.5b01901
日期:2015.11.6
This report details the enantioselective synthesis of β-amino-α-bromo nitroalkanes with β-alkyl substituents, using homogeneous catalysis to prepare either antipode. Use of a bifunctional Brønsted base/acid catalyst allows equal access to either enantiomer of the products, enabling the use of Umpolung Amide Synthesis (UmAS) to prepare the corresponding L- or D-α-amino amide bearing alkyl side chains—overall
该报告详细介绍了使用均相催化制备对映体时,对具有β-烷基取代基的β-氨基-α-溴硝基硝基烷的对映选择性合成。使用双功能布朗斯台德碱/酸催化剂可以平等地获得产品的对映异构体,从而可以使用U酰胺合成(UmAS)制备相应的带有烷基侧链的L-或D-α-氨基酰胺。离醛仅四个步骤。该方法还解决了溴硝基甲烷和固体氢氧化物碱之间的潜在不相容性。