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。