An Efficient Entry to syn- and anti-Selective Isoindolinones via an Organocatalytic Direct Mannich/Lactamization Sequence
摘要:
An organocatalytic direct Mannich-lactamization sequence for the syntheses of pharmacologically important enantioenriched isoindolinones is reported. The method utilizes simple a-amino acids to deliver syn- and anti- selective isoindolinones with remarkably high enantioselectivity (up to >99% ee) in good to excellent yields and diastereomeric ratios. The overall sequence involves one C-C and two C-N bond forming events in one pot starting from inexpensive starting material.
Asymmetric hydrogenolysis of racemic tertiary alcohols, 3-substituted 3-hydroxyisoindolin-1-ones, was developed using chiral phosphoric acid as catalyst and a Hantzsch ester as the hydrogen source with up to 95% ee. The reaction process of this asymmetric transfer hydrogenation may occur directly through the acyliminium ion intermediate.
使用手性磷酸作为催化剂和 Hantzsch 酯作为氢源开发了外消旋叔醇(3-取代的 3-羟基异吲哚啉-1-酮)的不对称氢解,其 ee 高达 95%。这种不对称转移氢化的反应过程可以直接通过酰亚胺离子中间体发生。