Addition of Molecular Fluorine to Azlactones: General Synthetic Method of erythro-.BETA.-Fluorinated .ALPHA.-Amino Acids.
作者:Chikara KANEKO、Jun CHIBA、Akemi TOYOTA、Masayuki SATO
DOI:10.1248/cpb.43.760
日期:——
Reaction of molecular fluorine with unsaturated azlactones derived from appropriate aldehydes (or ketones) and benzoylglycine afforded the difluorinated adducts. The reductive amination reaction of the β-fluorinated α-oxoalkanoic acids obtained from the adducts by basic hydrolysis gave erythro-β-fluorinated aliphatic α-amino acids. The same reactions, when applied to methyl 3-phenyl-2-benzoylaminoacrylate, afforded the corresponding aromatic amino acid. Hence, the entire sequence provides a general method for the synthesis of erythro-β-fluorinated α-amino acids.
分子氟与由适当醛类(或酮类)和苯甲酰甘氨酸生成的不饱和氮内酯反应,可得到二氟化加合物。通过碱性水解从加合物中得到的 β-氟化 α-氧代烷酸经还原胺化反应生成红-β-氟化脂肪族 α-氨基酸。同样的反应用于 3-苯基-2-苯甲酰氨基丙烯酸甲酯时,可得到相应的芳香族氨基酸。因此,整个序列提供了一种合成红-β-氟化 α-氨基酸的通用方法。