ol0c03383_si_001.pdf (6.75 MB)
Enantioselective Synthesis of 3‑Allylindolizines via Sequential Rh-Catalyzed Asymmetric Allylation and Tschitschibabin Reaction
journal contributionposted on 2020-12-02, 16:34 authored by Ke Li, Changkun Li
The first highly regio- and enantioselective synthesis of 3-allylindolizines has been developed by the sequential Rh-catalyzed asymmetric allylation and Tschitschibabin reaction. Above the 20:1 branch/linear ratio, up to a 96% yield and 99% ee could be obtained with the help of tert-butyl-substituted chiral bisoxazolinephosphine ligand. In situ generated highly nucleophilic 2-alkylpyridinium ylides are utilized to undergo the asymmetric alkylation reaction before cyclization.
eeratioligand3- allylindolizinescyclizationenantioselective synthesisalkylation reactionSequential Rh-Catalyzed Asymmetric ...regioTschitschibabin Reactionallylationbisoxazolinetertchiralbutyl-substitutedsequential Rh-catalyzedTschitschibabin reactionnucleophilic 2- alkylpyridinium ylidesEnantioselective SynthesisAllylindolizine