[EN] SUBSTITUTED PIXYL PROTECTING GROUPS FOR OLIGONUCLEOTIDE SYNTHESIS<br/>[FR] GROUPES SUBSTITUES DE PROTECTION DE PIXYLE DESTINES A UNE SYNTHESE D'OLIGONUCLEOTIDES
申请人:ISIS PHARMACEUTICALS INC
公开号:WO2005077966A1
公开(公告)日:2005-08-25
The present invention describes an improved hydroxyl protecting group of formula (1), wherein R2 and R7 are specified substituents and Q is O, S, NR10 or N(C=O)R10.
DDQ mediated regiospecific protection of primary alcohol and deprotection under neutral conditions: Application of new p -methoxy benzyl-pixyl ether as reagent of choice for nucleoside protection
作者:Penjarla Srishylam、A. Raji Reddy、Shyamapada Banerjee、Santhosh Penta、Yogesh S. Sanghvi
DOI:10.1016/j.tetlet.2017.05.066
日期:2017.6
A simple and efficient protocol is described for regiosepecific protection of primary hydroxyl group both in nucleosides and other molecules with p-methoxy-benzyl 2,7-dimethyl pixylether (MBDPE) in presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). Furthermore, swift deprotection of 2, 7-dimethylpixyl (DMPx) is accomplished with DDQ in MeOH. Both procedures are successfully implemented on
一个简单的,高效的协议被用于在两个核苷和其它分子与伯羟基的保护regiosepecific描述p -米乙氧基b enzyl 2,7- d imethyl p ixyl ë疗法(MBDPE)中的存在2,3-二氯5,6-二氰基-1,4-苯醌(DDQ)。此外,用DDQ在MeOH中快速脱保护2,7-二甲基pixyl(DMPx)。两种方法均在革兰氏级合成修饰核苷上成功实现。该方案为DMPx基团的选择性保护和脱保护提供了温和和中性的条件,同时可与其他常规保护基团(例如苯甲酰基,苄基,THP,TBDPS和丙酮化物)相容。
Copper(II)nitrate catalyzed regioselective protection of primary alcohols with 4,4′-dimethoxytrityl and 2,7-dimethyl-9-phenyl xanthen-9-yl groups in nucleosides and carbohydrates
作者:Srishylam Penjarla、S. Rajendra Prasad、Dhande Sudhakar Reddy、Shyamapada Banerjee、Santhosh Penta、Yogesh S. Sanghvi
DOI:10.1080/15257770.2018.1460480
日期:2018.4.3
ABSTRACT Regioselective protection of primary hydroxylgroup in nucleoside and carbohydrate analogs was accomplished using dimethoxytrityl alcohol (DMTr-OH) or dimethylpixyl alcohol (DMPx-OH) in presence of copper(II)nitrate as a Lewis acid catalyst. Excellent selectivity was observed for the protection of primary hydroxylgroup over secondary while glycosidic bond remain unaffected. Utility of this
Further Optimization of Detritylation in Solid-Phase Oligodeoxyribonucleotide Synthesis
作者:Kha Tram、Yogesh S. Sanghvi、Hongbin Yan
DOI:10.1080/15257770.2010.537291
日期:2011.1.21
protecting groups) during solid-phasesynthesis of oligodeoxyribonucleotides were investigated. Di- and tri-chloroacetic acids of variable concentrations were used to study the removal of the 4,4′-dimethoxytrityl (DMTr) group. It was found that the DMTr group could be completely removed under much milder acidic conditions than what are currently used for automated solid-phasesynthesis. The 2,7-dimethylpixyl
A simple and efficient protocol is developed for regioselective protection of primary hydroxyl group of nucleosides using 2,7-dimethylpixyliumtrifluoroacetate, prepared in-situ from 2,7-dimethyl-9-phenylxanthen-9-ol (DMPx-OH) and trifluoroacetic anhydride (TFAA). Furthermore deprotection of DMPx group is accomplished with TFAA in shorter reaction times with excellent yields in DCM:Methanol solvent