Hydrogen‐Borrowing Alkylation of 1,2‐Amino Alcohols in the Synthesis of Enantioenriched γ‐Aminobutyric Acids
作者:Christopher J. J. Hall、William R. F. Goundry、Timothy J. Donohoe
DOI:10.1002/anie.202100922
日期:2021.3.22
For the first time we have been able to employ enantiopure 1,2‐aminoalcohols derived from abundant amino acids in C−C bond‐forming hydrogen‐borrowing alkylation reactions. These reactions are facilitated by the use of the aryl ketone Ph*COMe. Racemisation of the amine stereocentre during alkylation can be prevented by the use of sub‐stoichiometric base and protection of the nitrogen with a sterically
The synthesis of the dihydrochloride salts of (R)-1 and (S)-1 2-(aminomethyl)piperidine is reported starting from either (S) or (R) lysine, respectively. A key step in the synthetic protocol involves the in situ formation of aziridinium 8, which then undergoes an intramolecular ringopening with concomitant piperidinium ring formation, in a stereoselective manner. The route offers a practical synthesis