Synthesis of adenophostin A and congeners modified at glucose
作者:Rachel D. Marwood、Andrew M. Riley、David J. Jenkins、Barry V. L. Potter
DOI:10.1039/b001386m
日期:——
A convergent route is described to the super-potent 1D-myo-inositol 1,4,5-trisphosphate receptor agonist adenophostin A (2) and analogues 5 and 7, in which the glucose bisphosphate unit is replaced by corresponding xylose bisphosphate and mannose bisphosphate units respectively. Adenosine was converted into its 2′,3′-O-p-methoxybenzylidene derivative 8ab, which was selectively N6-dimethoxytritylated by a transient protection method. 5′-O-Benzylation followed by reductive acetal cleavage gave, after separation from its 3′-O-p-methoxybenzyl isomer, the versatile glycosyl acceptor 5′-O-benzyl-N6-dimethoxytrityl-2′-O-p-methoxybenzyladenosine 13. Coupling of 13 with selectively protected glucopyranosyl, xylopyranosyl or mannopyranosyl dimethyl phosphites gave the required 3′-O-α-pyranosyl adenosine derivatives. Acidic hydrolysis gave corresponding N6-unprotected triols which were phosphitylated using bis(benzyloxy)(diisopropylamino)phosphine and imidazolium triflate without further N6-protection. Deprotection gave the target trisphosphates 2, 5 and 7. Synthetic adenophostin A (2) was identical with a sample of natural material in all respects. Analogues 5 and 7 will be useful for structure–activity studies on the adenophostins.
An expeditious route to the synthesis of adenophostin A
作者:Nicole C.R. van Straten、Gijsbert A. van der Marel、Jacques H. van Boom
DOI:10.1016/0040-4039(96)00632-6
日期:1996.5
Glycosylation of 1,2-O-isopropylidene-5-O-tert-butyldiphenylsilyl-α-D-ribofuranosev(8) with ethyl 3,4,6-tri-O-acetyl-2-O-benzyl-1-thio-α/β-D-glucopyranoside (7) under the agency of N-iodosuccinimide and trifluoromethanesulfonic acid (cat.) afforded α-linked dimer 10 in 95% yield. Vorbrüggen-type condensation of 12, obtained by deacetonation of 10 and subsequent acetylation, with bis-trimethylsilyl
Adenophostin A and analogues modified at the adenine moiety: synthesis, conformational analysis and biological activity
作者:Charles N. Borissow、Steven J. Black、Michael Paul、Stephen C. Tovey、Skarlatos G. Dedos、Colin W. Taylor、Barry V. L. Potter
DOI:10.1039/b415229h
日期:——
The synthesis of adenophostin A (2) and two analogues [etheno adenophostin (4) and 8-bromo adenophostin (5)] modified at the adenine moiety, is reported. A combination of NMR analysis and molecular modelling was used to compare their structures in solution and determined that they all adopt very similar conformations. The analogues were tested for their ability to mobilise Ca2+ from DT40 cells expressing recombinant Type 1 rat Ins(1,4,5)P3R which reveals etheno adenophostin as a high affinity fluorescent probe of the Ins(1,4,5)P3R. 8-Bromo adenophostin was only slightly less potent. The biological results support our current hypothesis regarding the binding mode of adenophostin A at the Ins(1,4,5)P3R, i. e. that a cation–π interaction between the base moiety and Arg 504 of the receptor in combination with H-bonding may be responsible for the high potency of adenophostin A relative to Ins(1,4,5)P3.
报告了腺苷 A(2)和两种在腺嘌呤分子上进行了修饰的类似物[乙烯腺苷(4)和 8-溴腺苷(5)]的合成过程。通过核磁共振分析和分子建模相结合的方法来比较它们在溶液中的结构,结果表明它们都采用了非常相似的构象。对这些类似物从表达重组 1 型大鼠 Ins(1,4,5)P3R 的 DT40 细胞中调动 Ca2+ 的能力进行了测试,结果显示乙烯腺苷是 Ins(1,4,5)P3R 的高亲和力荧光探针。8-Bromo adenophostin 的效力略低。生物学结果支持了我们目前关于腺苷 A 与 Ins(1,4,5)P3R 结合模式的假设,即碱基分子与受体 Arg 504 之间的阳离子-π 相互作用与 H 键结合可能是腺苷 A 相对于 Ins(1,4,5)P3 具有高效力的原因。
IP3 Receptor-Ligand. 1: Synthesis of Adenophostin A
作者:H Hotoda
DOI:10.1016/00404-0399(50)0916z-
日期:1995.7.10
Adenophostin A, a potent IP3 receptor-agonist, was synthesized. The basic skeleton with 3'-O-(alpha-D-glucosyl)adenosine was constructed by AgClO4-gamma-collidine-promoted glycosylation employing 2-O-benzyl-3,4,6-tri-O-acetyl-alpha-D-glucopyranosyl bromide as a glycosyl donor.
Synthesis of adenophostin A
作者:Rachel D Marwood、Vanessa Correa、Colin W Taylor、Barry V L. Potter
DOI:10.1016/s0957-4166(99)00491-7
日期:2000.2
The natural product and potent agonist of the D-myo-inositol 1,4,5-trisphosphate receptor, adenophostin A, was synthesised from adenosine and D-glucose using efficient methodology. The synthetic material was equipotent with naturally occurring adenophostin A in evoking Ca(2+) release from the intracellular stores of permeabilised cells. (C) 2000 Elsevier Science Ltd. All rights reserved.