Synthesis of optically active oxazoles from phosphorylated 2H-azirines and N-protected amino acids or peptides
作者:Francisco Palacios、Ana Marı́a Ochoa de Retana、José Ignacio Gil、José Marı́a Alonso
DOI:10.1016/s0957-4166(02)00686-9
日期:2002.11
triphenylphosphine and hexachloroethane in the presence of triethylamine leads to the formation of racemic and opticallyactive phosphorylated oxazoles containing N-protected amino acid residues 8 and 10. Deprotection of these oxazoles gives aminoalkyl oxazoles 11 and 12. 2H-Azirines 1 and 6 also react with N-protected peptides 13 and give functionalized ketamides 14 and 15, ring closure of which leads to the formation