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 optically active 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
光学活性的磷酸化的恶唑的简单合成8,10,11,和12含有2个氨基酸残基ħ -azirine-氧化膦1或-phosphonates 6进行说明。衍生自氧化膦1和膦酸酯6的2个H-叠氮基与N保护的氨基酸2的开环反应,得到官能化的磷酸化酮酰胺3和7。酮酰胺3和7的环化在三乙胺存在下与三苯膦和六氯乙烷反应会导致形成外消旋和旋光的磷酸化恶唑,其中含有N保护的氨基酸残基8和10。这些恶唑的脱保护得到氨基烷基恶唑11和12。2 H-嗪1和6也与N-保护的肽13反应并生成官能化的酮酰胺14和15,其闭环导致形成含有肽残基16和17的磷酸化恶唑。