2′-5′,3′-5′ Linked triadenylates have been synthesized by direct bisadenylylation of adenosine 2′ and 3′ hydroxyls with an adenosine 5′-phosphorochloridite followed by oxidation.
Pentopyranosyl oligonucleotide systems. Part 11: systems with shortened backbones: (?)-β-ribopyranosyl-(4′→3′)- and (?)-α-lyxopyranosyl-(4′→3′)-oligonucleotides
作者:H Wippo
DOI:10.1016/s0968-0896(01)00220-6
日期:2001.9
>3')-oligonucleotide system-a member of a pentopyranosyloligonucleotide family containing a shortened backbone-is capable of cooperative base-pairing and of cross-pairing with DNA and RNA. In contrast, corresponding (D)-beta-ribopyransoyl-(4'-->3')-oligonucleotides do not show base-pairing under similar conditions. We conclude that oligonucleotidesystems can violate the 'six-bonds-per-backbone-unit'
Novel pyrazine derivatives or salts thereof, pharmaceutical composition containing the same, and production intermediates thereof
申请人:Toyama Chemical Co., Ltd.
公开号:US20030130213A1
公开(公告)日:2003-07-10
Pyrazine derivatives represented by general formula [1]:
1
wherein the variables are as defined in the specification, or salts thereof have an excellent antiviral activity and are useful as a therapeutic agent for treating viral infections. Further, fluoropyrazine-carboxamide derivatives represented by general formula [2]:
2
wherein the variables are as defined in the specification, or salts thereof are useful as an intermediate for production of the compounds of general formula [1], and as an intermediate for production of the fluoropyrazine-carboxamide derivatives of which one typical example is 6-fluoro-3-hyroxy-2-pyrazine-carboxamide having an antiviral activity.
Total synthesis of optically active myo-inositol 1,4,5-trisphosphate and myo-inositol 1,3,4,5-tetrakisphosphate
作者:C. E. Dreef、R. J. Tuinman、C. J. J. Elie、G. A. van der Marel、J. H. van Boom
DOI:10.1002/recl.19881070508
日期:——
A convenient approach to the preparation of the title compounds illustrating selective protection, optical resolution and phosphorylation is presented.
介绍了一种方便的制备标题化合物的方法,该方法说明了选择性保护,光学拆分和磷酸化作用。
Use of 2-trimethylsilylethyl as a protecting group in phosphate monoester synthesis
作者:Akiyoshi Sawabe、Sandra A. Filla、Satoru Masamune
DOI:10.1016/0040-4039(93)88016-c
日期:1992.12
demonstrated that phosphorylation of a highly hindered hydroxyl group can be achieved via sequential treatment with (1) 2-trimethylsilylethyl dichlorophosphite, (2) 2-trimethylsilylethyl alcohol, and (3) hydrogen peroxide. The resulting triester survives a variety of reaction conditions but may be cleaved with fluoride ion to afford the phosphate monoester.