Ligand-controlled C(sp³)-H arylation and olefination in synthesis of unnatural chiral α-amino acids.

ABSTRACT: The use of ligands to tune the reactivity and selectivity of transition metal catalysts for C(sp(3))-H bond functionalization is a central challenge in synthetic organic chemistry. Herein, we report a rare example of catalyst-controlled C(sp(3))-H arylation using pyridine and quinoline derivatives: The former promotes exclusive monoarylation, whereas the latter activates the catalyst further to achieve diarylation. Successive application of these ligands enables the sequential diarylation of a methyl group in an alanine derivative with two different aryl iodides, affording a wide range of β-Ar-β-Ar'-α-amino acids with excellent levels of diastereoselectivity (diastereomeric ratio > 20:1). Both configurations of the β-chiral center can be accessed by choosing the order in which the aryl gro

SUBMITTER: He J 

PROVIDER: S-EPMC4179246 | biostudies-literature | 2014 Mar

REPOSITORIES: biostudies-literature