Synthesis of ribonucleoside 3′,5′-cyclic phosphorothioates using a modified hydroxybenzotriazole phosphotriester approach
作者:E. de Vroom、G. A. van der Marel、J. H. van Boom
DOI:10.1002/recl.19871061106
日期:——
Phosphorothioylation of 3′,5′-dihydroxyl ribonucleosides with O-(2-chlorophenyl) O, O-bis[6-(trifluoromethyl)-1-benzotriazolyl] phosphorothioate, followed by addition of N-methyl-imidazole and removal of protecting groups, gives ribonucleosides 3′,5′-cyclic phosphorothioates. The latter compounds could also be prepared by phosphorothioylation of 2′,3′,5′-trihydroxyl ribonucleosides.
Oligonucleotide synthesis by the use of a 2-(levulinyloxymethyl)-5-nitrobenzoyl group as the novel base-labile protecting Group for the 5′-hydroxyl groups of ribonucleoside and 2′-deoxyribonucleoside 3′-phosphoramidites
A novel 2-(levulinyloxymethyl)-5-nitrobenzoyl (LMNBz) protectinggroup for the 5′ position of nucleoside 3′-phosphoramidites was successfully applied to the solid-phase synthesis of both an oligodeoxyribonucleotide (TpTpT and TpTpTpT) and an octaribonucleotide in combination with a 2′-O-Thp protectinggroup (UpCpApGpUpUpGpG). The LMNBz group was simply unmasked due to its base-labile property by a
一种新型的2-(乙酰丙酰氧基甲基)-5-硝基苯甲酰基(LMNBz)核苷3'-亚磷酰胺的5'位保护基团已成功地用于寡脱氧核糖核苷酸(TpTpT和TpTpTpTT)和八核糖核苷酸的固相合成带有2'- O -Thp保护基(UpCpApGpUpUpGpG)。LMNBz基团由于其对碱不稳定的特性而通过两步程序(即先用0.5 M的水合肼在1:4的乙酸-吡啶中处理,然后再用0.5 M的咪唑的乙腈处理)简单地将其掩盖。
Synthesis of a dodecaribonucleotide, GUAUCAAUAAUG, by use of "fully" protected ribonucleotide building blocks
作者:Takashi Kamimura、Masahiko Tsuchiya、Kenichi Urakami、Koji Koura、Mitsuo Sekine、Kazuko Shinozaki、Kinichiro Miura、Tsujiaki Hata