new chiral C(3)-symmetric tris(beta-hydroxy phosphoramide) ligands have been synthesized via the reaction of trisphosphoramide ester and Grignard reagents. The catalytic asymmetric boranereduction of ketones with these new C(3)-symmetric chiral tris(beta-hydroxy phosphoramide)s was investigated. Structurally well-defined, recoverable ligand 1d is an efficient catalyst for the enantioselective borane
Synthesis and Evaluation of Enantiopure HMPA Analogs in Samarium‐Diiodide‐Promoted Dearomatizations of N‐Acylated Indole Derivatives
作者:Chintada Nageswara Rao、Hans‐Ulrich Reissig
DOI:10.1002/ejoc.202101065
日期:2021.12.14
Among several chiral (S)-proline-based HMPAanalogs, the shown ligand strongly activates samariumdiiodide allowing the very fast and efficient conversion of an N-acylated indole into an indoline derivative. So far the achieved enantioselectivity is at best moderate.
在几种基于手性 ( S )-脯氨酸的 HMPA 类似物中,所示配体强烈激活二碘化钐,允许 N-酰化吲哚非常快速有效地转化为二氢吲哚衍生物。到目前为止,实现的对映选择性充其量是中等的。