[3 + 2]-Annulation of pyridinium ylides with 1-chloro-2-nitrostyrenes unveils a tubulin polymerization inhibitor
作者:Alexander V. Aksenov、Nikolai A. Arutiunov、Nikita K. Kirilov、Dmitrii A. Aksenov、Igor Yu. Grishin、Nicolai A. Aksenov、Huifen Wang、Liqin Du、Tania Betancourt、Stephen C. Pelly、Alexander Kornienko、Michael Rubin
DOI:10.1039/d1ob01141c
日期:——
via [3 + 2]-cycloaddition of pyridinium ylides to 1-chloro-2-nitrostyrenes. The synthesized molecules were evaluated for antiproliferative activities against a BE(2)-C neuroblastoma cell line with several compounds decreasing the viability of cancer cells. Indolizine 9db showed higher potency than that of all-trans-retinoic acid, an approved cancer drug. Mechanistically, it was found to inhibit tubulin
中氮茚和吡唑并[1,5- a ]吡啶是通过吡啶鎓叶立德与1-氯-2-硝基苯乙烯的[3+2]-环加成反应制备的。评估了合成分子对 BE(2)-C 神经母细胞瘤细胞系的抗增殖活性,其中几种化合物可降低癌细胞的活力。中氮茚9db显示出比全反式视黄酸(一种已批准的抗癌药物)更高的效力。从机制上讲,它被发现可以抑制微管蛋白聚合,因此提出可以利用所发现的化学物质来开发新型微管靶向抗癌剂。
Copper-mediated oxidative [3 + 2]-annulation of nitroalkenes and pyridinium imines: efficient synthesis of 3-fluoro- and 3-nitro-pyrazolo[1,5-<i>a</i>]pyridines
作者:Vladimir A. Motornov、Andrey A. Tabolin、Yulia V. Nelyubina、Valentine G. Nenajdenko、Sema L. Ioffe
DOI:10.1039/c9ob02668a
日期:——
efficient route to pyrazolo[1,5-a]pyridines by Cu(OAc)2-promoted oxidative [3 + 2]-annulation of nitroalkenes with in situ generated pyridinium imines is developed. The reaction with α-fluoronitroalkenes enables the first preparative synthesis of 3-fluoro-pyrazolo[1,5-a]pyridines. Cycloaddition with α-unsubstituted nitroalkenes provides access to 3-nitro-pyrazolo[1,5-a]pyridines in excellent yields. A broad
Synthesis of 2 or 3-(hetero)aryl pyrazolo[1,5-a]pyridines through [3 + 2] cycloaddition ofN-aminopyridine with β-nitrostyrenes followed byin situdenitration under metal-free and mild conditions are described.