Facile N-Derivatization of α-Amino Esters and Amides via Benzotriazolylmethyl Derivatives
作者:Alan R. Katritzky、Nataliya Kirichenko、Boris V. Rogovoy、Hai-Ying He
DOI:10.1021/jo026622f
日期:2003.11.1
Alpha-(N-substituted amino)esters were prepared in a two-step procedure from available unsubstituted alpha-amino esters. alpha-Amino esters are first converted into the corresponding N-benzotriazolylmethyl derivatives; in the second step, the benzotriazole group is substituted by various nucleophiles with or without the presence of a Lewis acid to give substituted alpha-amino esters in high overall
α-(N-取代的氨基)酯是通过两步程序从可用的未取代的α-氨基酯制备的。首先将α-氨基酯转化为相应的N-苯并三唑基甲基衍生物;在第二步中,在有或没有路易斯酸的情况下,苯并三唑基被各种亲核试剂取代,从而在温和条件下以高总收率得到取代的α-氨基酯,没有消旋现象。Boc保护的氨基酸被转化为α-氨基酰胺;随后的脱保护作用使其转化为类似于α-氨基酯的N-取代衍生物,而在温和条件下不以高收率外消旋化。