Ring closure reactions of 1, 6-diamino-4- （4-chlorophenyl）-2-oxopyridine-3, 5-dicarbonitrile （1） with various 1, 3-dielectrophiles namely, diethyl malonate, ethyl cthoxymethylene cyanoacetate, 2-cyano-3, 3-bis（me...Ring closure reactions of 1, 6-diamino-4- （4-chlorophenyl）-2-oxopyridine-3, 5-dicarbonitrile （1） with various 1, 3-dielectrophiles namely, diethyl malonate, ethyl cthoxymethylene cyanoacetate, 2-cyano-3, 3-bis（methylthio） acrylonitril, dimethyl acetylenedicarboxylate, dehydroacetic acid, chromon- 3-carbonitrile and 3-formylchromone led to the formation of the target bihetherocylicl,2,4-triazepines. The effect of 3-phenylazo-2, 4-pentandione, ethyl ct-cyano-ct-phenylazoacetate and 3, 1-benzoxazin-4-one derivative on 1 was also discussed.展开更多
Triazolopyridines are an important kind of fused-ring compounds.A HOCl-promoted triazolopyridine formation strategy is reported here for the first time in which hypochlorous acid(HOCl)mildly and efficiently promotes t...Triazolopyridines are an important kind of fused-ring compounds.A HOCl-promoted triazolopyridine formation strategy is reported here for the first time in which hypochlorous acid(HOCl)mildly and efficiently promotes the formation of 1,2,4-triazolo[4,3-a]pyridines NT1-NT6 from various 2-pyridylhydrazones N1-N6.N6,a rhodol-pyridylhydrazone hybrid,was developed into a fluorescent probe for the selective detection of HOCl,and successfully applied to probe endogenous HOCl in living cells and zebrafish in situ and in real time.The present intramolecular cyclization reaction is selective and atom-economical,thereby not only providing an important approach for the convenient synthesis of triazolopyridines,but also offering a general strategy for sensitive,selective and biocompatible detection of endogenous HOCl in complex biosystems.展开更多
文摘Ring closure reactions of 1, 6-diamino-4- （4-chlorophenyl）-2-oxopyridine-3, 5-dicarbonitrile （1） with various 1, 3-dielectrophiles namely, diethyl malonate, ethyl cthoxymethylene cyanoacetate, 2-cyano-3, 3-bis（methylthio） acrylonitril, dimethyl acetylenedicarboxylate, dehydroacetic acid, chromon- 3-carbonitrile and 3-formylchromone led to the formation of the target bihetherocylicl,2,4-triazepines. The effect of 3-phenylazo-2, 4-pentandione, ethyl ct-cyano-ct-phenylazoacetate and 3, 1-benzoxazin-4-one derivative on 1 was also discussed.
基金the National Natural Science Foundation of China(Nos.21977082,21472148 and 21807088)Open Funding Project of the State Key Laboratory of Bioreactor Engineering(No.2018OPEN12)+2 种基金Special Foundation of the Education Committee of Shaanxi Province(No.18JK0702)Technology Plan Project of Xi’an(Nos.201805040YD18CG24 and GXYD18.1)Academic Backbone of Northwest University Outstanding Youth Support Program。
文摘Triazolopyridines are an important kind of fused-ring compounds.A HOCl-promoted triazolopyridine formation strategy is reported here for the first time in which hypochlorous acid(HOCl)mildly and efficiently promotes the formation of 1,2,4-triazolo[4,3-a]pyridines NT1-NT6 from various 2-pyridylhydrazones N1-N6.N6,a rhodol-pyridylhydrazone hybrid,was developed into a fluorescent probe for the selective detection of HOCl,and successfully applied to probe endogenous HOCl in living cells and zebrafish in situ and in real time.The present intramolecular cyclization reaction is selective and atom-economical,thereby not only providing an important approach for the convenient synthesis of triazolopyridines,but also offering a general strategy for sensitive,selective and biocompatible detection of endogenous HOCl in complex biosystems.
