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‐amino alcohols 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
我们首次能够在 C-C 键形成借氢烷基化反应中使用源自丰富氨基酸的对映体纯 1,2-氨基醇。使用芳基酮 Ph*COMe 可以促进这些反应。通过使用亚化学计量的碱并用位阻三苯甲烷(三苯甲基)或苄基保护氮,可以防止烷基化过程中胺立构中心的外消旋化。 Ph* 和三苯甲基在一锅中即可轻松裂解,得到 γ-氨基丁酸 (GABA) 盐酸盐产品,无需进一步纯化。这两个步骤可以依次进行,无需分离借氢中间体,从而无需柱色谱法。