The phosphorylation of Ac-Ser- NHMe or Ac- Gly-Ser-Gly-NHMe with diphenyl phosphorochloridate /pyridine gave diphenyl hydrogen phosphate in high yield instead of the expected-Ser(PO3Ph2)-peptide. A 31P n.m.r . spectroscopy study of the phosphorylation reaction established that, with the use of diphenyl phosphorochloridate in pyridine, the intermediate diphenyl phosphoro-N-pyridinium chloride was the active phosphorylation species and that phosphorylation of the hydroxy group of Ac-Ser- NHMe or Ac- Gly-Ser-Gly-NHMe was followed by rapid dephosphorylation of the O-( diphenylphosphono ) seryl residue. While diethyl phosphorochloridate /pyridine phosphorylation of Ac-Ser- NHMe also did not give Ac-Ser(PO3Et2)- NHMe, both the two-step ( i ) diethyl phosphorochloridite /pyridine, (ii) iodine/water and the two-step (i) diethyl N,N-diethylphosphoramidite/1H-tetrazole, (ii) iodine/water 'phosphite-triester' phosphorylation of Ac-Ser- NHMe gave Ac- Ser(PO3Et2)- NHMe in high yield.
用二苯基
磷酰
氯/
吡啶对 Ac-Ser- NHMe 或 Ac- Gly-Ser-Gly-NHMe 进行
磷酸化反应,可获得高产率的
磷酸二苯基氢,而不是预期的er(PO3Ph2)肽。对
磷酸化反应的 31P n.m.r .光谱研究表明,在
吡啶中使用二苯基
磷酰
氯时,中间体二苯基
磷-N-
吡啶氯化物是活跃的
磷酸化物种,Ac-Ser- NHMe 或 Ac- Gly-Ser-Gly-NHMe 的羟基
磷酸化后,O-( 二苯基
磷)
丝氨酸残基迅速去
磷酸化。虽然
二乙基氯膦酸盐/
吡啶对 Ac-Ser- NHMe 的
磷酸化也不会产生 Ac-Ser(PO3Et2)-NHMe,但两步法(i)
二乙基氯膦酸盐/
吡啶、(ii)
碘/
水和两步法 (i) N,N-二乙基亚
磷酰胺二
乙酯/1H-
四氮唑,(ii)
碘/
水 "
亚磷酸三酯 "
磷酸化 Ac-Ser- NHMe,都能高产率地得到 Ac-Ser(PO3Et2)-NHMe。