Application of a Solid-Phase β-Triphosphitylating Reagent in the Synthesis of Nucleoside β-Triphosphates
摘要:
A beta-triphosphitylating reagent was subjected to reaction with aminomethyl polystyrene resin-bound p-acetoxybenzyl alcohol to yield the corresponding polymer-bound beta-triphosphitylating reagent. The solid-phase reagent was reacted with unprotected nucleosides (e.g., 3'-azido-3'-deoxythymidine, cytidine, thymidine, uridine, inosine, or adenosine) in the presence of 1H-tetrazole. Polymer-bound nucleosides underwent oxidation with t-butyl hydroperoxide, deprotection of cyanoethoxy groups with DBU, and the acidic cleavage, respectively, to afford only monosubstituted 5'-O-beta-triphosphorylated nucleosides.
Synthesis of naturally occurring phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P3] and its diastereoisomers
作者:Piers R. J. Gaffney、Colin B. Reese
DOI:10.1039/b007267m
日期:——
The chemical synthesis of naturallyoccurring phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P3] 2, in which the 1- and 2-hydroxy functions of the glycerol moiety are esterified with stearic and arachidonic acid, respectively, is described. The synthesis of three diastereoisomers 41, 42 and 43 of PtdIns(3,4,5)P3 is also reported.
Synthesis of unsaturated phosphatidylinositol 4-phosphates and the effects of substrate unsaturation on SopB phosphatase activity
作者:Samuel Furse、LokHang Mak、Edward W. Tate、Richard H. Templer、Oscar Ces、Rüdiger Woscholski、Piers R. J. Gaffney
DOI:10.1039/c4ob02258k
日期:——
Single enantiomers of PI-4-P, with a range ofsn-2-fatty acid esters, were prepared efficiently. The effects of the degree ofsn-2-unsaturation on the kinetic parameters ofSopB were determined.
2′-O-Aminoethyl Oligoribonucleotides Containing Novel Base Analogues: Synthesis and Triple-Helix Formation At Pyrimidine/Purine Inversion Sites
作者:Sabrina Buchini、Christian J. Leumann
DOI:10.1002/ejoc.200600182
日期:2006.7
The synthesis of a common sugar intermediate for the 2′-aminoethyl-ribonucleoside synthesis in 9 steps and an overall yield of 33 % starting from D-ribose is described. This intermediate was successfully used for the synthesis of the 2′-aminoethyl-ribonucleosides containing the bases thymine (t), 5-methylcytosine (c), 5-methyl-2-pyrimidinone (x), 2-aminopurine (ap) and guanine (g). These were subsequently
描述了在 9 个步骤中合成用于 2'-氨基乙基-核糖核苷合成的普通糖中间体,从 D-核糖开始,总产率为 33%。该中间体已成功用于合成含有碱基胸腺嘧啶 (t)、5-甲基胞嘧啶 (c)、5-甲基-2-嘧啶酮 (x)、2-氨基嘌呤 (ap) 和鸟嘌呤的 2'-氨基乙基-核糖核苷(G)。这些随后被转化为相应的氰乙基亚磷酰胺结构单元,用于寡核苷酸合成。使用 DNA 合成仪制备 2'-氨基乙基寡核苷酸 15 聚体,并开发了优化的合成后脱保护方案,可防止在常规氨脱保护过程中 2'-氨基侧链氰乙基化。一系列全面改造,制备了三链体形成 2'-氨基乙基寡核糖核苷酸 (2'AE-TFO),其中 x 被设计为与双螺旋 DNA 靶标上的 CG 反转位点和 ap 以及 g 与 TA 反转位点结合。x-CG 碱基三重形成在不同序列环境中的亲和力通过 UV 和 CD 熔解分析进行评估。发现即使在所有 x 残基都连续排列在
Synthesis of unsaturated phosphatidylinositol 4,5-bisphosphate and analogues
作者:Nitesh Panchal、Piers R. J. Gaffney
DOI:10.1039/b907551h
日期:——
fatty acid esters, as well as phosphorothioate and acetylenic analogues. This strategy depends on masking the phosphate charges with base-labile cyanoethyl esters, and the hydroxyls of the target with mild acid-labile protecting groups. A two-step basic then acidic global unblocking of orthogonal protecting groups provides the target lipid. A xanthenylidene acetal was used for key temporary protection
Selective synthesis of chlorophosphoramidites using ionic liquids
作者:Eric J. Amigues、Christopher Hardacre、Gillian Keane、Marie E. Migaud、Sarah E. Norman、William R. Pitner
DOI:10.1039/b905000k
日期:——
sensitivity and impurity issues hampering existing traditional synthetic routes have been eased. Not only can stock chemicals be used without purification, but the reactions may be conducted at room temperature and at high concentrations. Furthermore, reaction times are reduced and rapid addition of reagents is possible whilst retaining tight control over product selectivity. Beyond their role as reaction