Synthesis of C-glycosyl amino acids: scope and limitations of the tandem Tebbe/Claisen approach
作者:David J. Chambers、Graham R. Evans、Antony J. Fairbanks
DOI:10.1016/j.tetasy.2004.11.035
日期:2005.1
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
氨基酸可用作与3-羟基缩醛酯化的偶联伴侣,作为串联Tebbe / Claisen方法合成C-糖基氨基酸的底物。尽管取代的α-氨基酸的酯未成功进行Tebbe或其他亚甲基化作用,但β-或γ-氨基酸的酯被亚甲基化生成乙烯基醚,然后进行平稳的热重排以生成β- C-糖苷产物。叔丁基酯被发现是不反应的试剂特伯,这样叔丁基保护可被用于其它羧酸。