Synthesis of Enantiopure N-and C-Protected homo-β-Amino Acids by Direct Homologation of α-Amino Acids ¶
作者:Romualdo Caputo、Ersilia Cassano、Luigi Longobardo、Giovanni Palumbo
DOI:10.1016/0040-4020(95)00778-7
日期:1995.11
Enantiopure N-and/or C-protected homo-β-amino acids are prepared readily and in good yields from N-protected α-amino acids with the same side chain, via reduction of the carboxyl function and conversion of the resulting N-protected β-amino alcohol into the corresponding β-amino iodide and then β-amino cyanide. The key step of this strategy is represented by the synthesis of the enantiopure N-protected
对映纯的N和/或C保护的均-β-氨基酸可通过减少羧基官能团和转化所得的N-保护的,容易地且由具有相同侧链的N-保护的α-氨基酸以高收率制备。将β-氨基醇转化为相应的β-氨基碘化物,然后转化为β-氨基氰化物。这种策略的关键步骤是由对映体纯的合成表示Ñ -保护的β-氨基碘化物2和3被平稳地从母体氨基醇得到的1通过聚合物结合的三芳基膦-I 2 在无水二氯甲烷中的络合物。