Asymmetric synthesis of α-alkylated α-amino acids: azocane-2-carboxylic acids
摘要:
Alpha-Alkylated azocane-2-carboxylic acid methyl esters 5 were synthesized with excellent enantiomeric excess (> 96%) in four steps starting from optically active beta-keto esters 1. The synthesis involved tetrazole formation, reduction, protection, and oxidation.
Asymmetric oxidation of β-ketoesters with benzoyl peroxide; enantioselective formation of protected tertiary alcohols
作者:Junning Lee、Shunichi Oya、John K. Snyder
DOI:10.1016/s0040-4039(00)79421-4
日期:1991.10
Asymmetric oxidation of β-ketoesters by the benzoylperoxide quench of their lithioenamines formed with (S)-valine-t-butyl esters has been accomplished with good enantioselectivity for the formation of tertiary benzoate esters. This procedure thus enables generation of tertiary alcohols in protected form.