Synthesis and Chemical Constitution of Diphenoxyphosphoryl Derivatives and Phosphonium Salts as Coupling Reagents for Peptide Segment Condensation
作者:Frank Hoffmann、Lothar Jäger、Carola Griehl
DOI:10.1080/10426500307942
日期:2003.2.1
The reactions of diphenoxyphosphoryl chloride ((PhO)(2)P(O)Cl) and different chlorophosphonium salts ([R3PCl]X, R = (CH3)(2)N, pyrrolidine, X=PF6-, BF4-), respectively, with 7-aza-1-hydroxybenzotriazole (HOAt), 1-hydroxybenzotriazole (HOBt), hydroximinomalonitrile (HOxDCO), and ethyl hydroximinocyanoacetate (HOxO) are described. The structures of the new compounds, which are useful coupling reagents for epimerization-free petide segment condensation, are discussed on the basis of their H-1, C-13 P-31 NMR, and IR spectra. The reactions of (PhO)(2)P(O)Cl lead to mixtures of O- and N-phosphorylated isomers of varying ratios. Contrary, reactions of chlorophosphonium salts yield exclusively one isomer.