Pyrinap ligands for enantioselective syntheses of amines.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33397992.
- Also identified by DOI 10.1038/s41467-020-20205-0 and PMC identifier 7782703.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Amines are a class of compounds of essential importance in organic synthesis, pharmaceuticals and agrochemicals. Due to the importance of chirality in many practical applications of amines, enantioselective syntheses of amines are of high current interest. Here, we wish to report the development of (R,R<sub>a</sub>)-N-Nap-Pyrinap and (R,S<sub>a</sub>)-N-Nap-Pyrinap ligands working with CuBr to catalyze the enantioselective A<sup>3</sup>-coupling of terminal alkynes, aldehydes, and amines affording optically active propargylic amines, which are platform molecules for the effective derivatization to different chiral amines. With a catalyst loading as low as 0.1 mol% even in gram scale reactions, this protocol is applied to the late stage modification of some drug molecules with highly sensitive functionalities and the asymmetric synthesis of the tubulin polymerization inhibitor (S)-(-)-N-acetylcolchinol in four steps. Mechanistic studies reveal that, unlike reported catalysts, a monomeric copper(I) complex bearing a single chiral ligand is involved in the enantioselectivity-determining step.
Medical subject headings
- Amines