van Boom J H, Burgers P M, Haasnoot C A
Nucleic Acids Res. 1976 Oct;3(10):2731-47. doi: 10.1093/nar/3.10.2731.
Phosphorylation of the easily accessible 3',5'-diesters 1a-d with diphenyl phosphorochloridate, followed by selective 5'-deacylation, affords the phosphotriester derivatives 2a-d in good yields. Alkaline treatment of 2a-d results in the formation of the 2',3'-cyclic phosphates (3a-d). The usefulness of the phosphotriester derivatives 2a-d is also demonstrated in the synthesis of the nucleotidyl-(3'-5')nucleoside 3'-phosphates U-Up (10a), U-Ap (11a), U-Cp (12a) and A-Gp (13a). The fully protected dinucleoside diphosphates 5c-8c, prepared by the phosphotriester method, are deprotected in two ways: (a) by a purely chemical method, affording the dinucleoside diphosphates in a circa one to one mixture of 2'- and 3'- isomers, 10b-13b and 10a-13a, respectively, and (b) by a mixed chemical-enzymatical approach which gives the pure 3'-phosphates (10a-13a).
用二苯基亚磷酰氯将易于获得的3',5'-二酯1a-d进行磷酸化,随后进行选择性5'-脱酰基反应,可高产率地得到磷酸三酯衍生物2a-d。对2a-d进行碱性处理会导致形成2',3'-环磷酸酯(3a-d)。磷酸三酯衍生物2a-d的实用性还体现在核苷酸基-(3'-5')核苷3'-磷酸酯U-Up(10a)、U-Ap(11a)、U-Cp(12a)和A-Gp(13a)的合成中。通过磷酸三酯法制备的完全保护的二核苷二磷酸酯5c-8c,有两种脱保护方法:(a)通过纯化学方法,分别得到2'-异构体和3'-异构体大约为1:1混合物的二核苷二磷酸酯,即10b-13b和10a-13a,以及(b)通过化学-酶混合方法,得到纯的3'-磷酸酯(10a-13a)。