Add time:09/09/2019 Source:sciencedirect.com
Amino acids may be used as coupling partners for esterification with 3-hydroxy glycals as substrates for the tandem Tebbe/Claisen approach to the synthesis of C-glycosyl amino acids. Whilst esters of substituted α-amino acids do not successfully undergo Tebbe, or other, methylenation, esters of β- or γ-amino acids are methylenated to yield vinyl ethers, which then undergo smooth thermal rearrangement to yield β-C-glycoside products. tert-Butyl esters are found to be unreactive to the Tebbe reagent, and as such tert-butyl protection may be used for other carboxylic acids.
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