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.
Desymmetrizing Asymmetric Ring Expansion of Cyclohexanones with α-Diazoacetates Catalyzed by Chiral Aluminum Lewis Acid
作者:Takuya Hashimoto、Yuki Naganawa、Keiji Maruoka
DOI:10.1021/ja202070j
日期:2011.6.15
in a 2:1 ratio was found to promote novel catalytic asymmetric ring expansion of cyclohexanone with α-substituted α-diazoacetates to give seven-membered rings with an all-carbon quaternary center. Application of this strategy to 4-substituted cyclohexanones opened up a novel way for the catalytic desymmetrizing asymmetric construction of cycloheptanones bearing remote α,δ-chiral centers.
Asymmetric synthesis of α-alkylated α-amino acids: azocane-2-carboxylic acids
作者:Gunda U. Georg、Xiangming Guan
DOI:10.1016/s0040-4039(00)77662-3
日期:1992.1
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.