Syntheses of 2‐aminothiazolederivatives of 4‐hydroxy‐chromene‐2‐one 2c–10c are reported in this paper. These compounds 2c–10c were prepared from 3‐(2‐bromoacetyl)‐4‐hydroxy‐chromene‐2‐one 1 and corresponding thiourea derivatives 2b–10b using Hantzsch reaction. The structures of all compounds were confirmed by IR and 1H‐NMR spectroscopy and elemental analyses. The molecules 2c–10c were evaluated for in vitro
(7-Hydroxy-2-oxo-2H-chromen-4-yl)-aceticacid hydrazide (2) was prepared from (7-hydroxy-2-oxo-2H-chromen-4-yl)-aceticacid ethyl ester (1) and 100% hydrazinehydrate. Compound 2, is the key intermediate for the synthesis of several series of new compounds such as Schiff's bases 3a-l, formic acid N'-[2-(7-hydroxy-2-oxo-2H- chromen-4-yl)acetyl] hydrazide (4), acetic acid N'-[2-(7-hydroxy-2-oxo-2H-chromen-4-
Resonance induced proton transfer leading to NIR emission in coumarin thiazole hybrid dyes: Synthesis and DFT insights
作者:Milind R. Shreykar、Nagaiyan Sekar
DOI:10.1016/j.tetlet.2016.07.097
日期:2016.9
Two novel coumarin thiazole hybrid dyes (E)-2-(3-(2-(4-(4-hydroxy-2-oxo-2H-chromen-3-yl)-2-morpholinothiazol-5-yl)vinyl)-5,5-dimethylcyclohex-2-en-1-ylidene)malononitrile (CSI) and (E)-2-(3-(2-(4-(4-methoxy-2-oxo-2H-chromen-3-yl)-2-morpholinothiazol-5-yl)vinyl)-5,5-dimethylcyclohex-2-en-1-ylidene)malononitrile (MeOCSI) were synthesized. CSI exhibits near infrared emission with very large Stokes shift
两种新型香豆素噻唑杂化染料(E)-2-(3-(2-(4-(4-(4-羟基-2-oxo-2 H -chromen-3-yl)-2-morpholinothiazol-5-yl)乙烯基) -5,5-二甲基环己-2-烯-1-基)丙二腈(CSI)和(E)-2-(3-(2-(4-(4-(4-甲氧基-2-oxo-2)H -chromen-3合成了(-基)-2-吗啉基噻唑-5-基)乙烯基)-5,5-二甲基环己基-2-烯-1-基)丙二腈(MeOCSI)。CSI表现出近红外发射,斯托克斯位移非常大。染料CSI显示出共振诱导的激发态分子内质子转移(RI-ESIPT)。DFT和TD-DFT计算显然支持并定义了发现。
Hantzsch reaction of 3-(2-bromoacetyl)-4-hydroxy-chromen-2-one. Synthesis of 3-(thiazol-4-yl)-4-hydroxy coumarines
作者:S. Sukdolak、S. Solujić、N. Manojlović、N. Vuković、L. J. Krstić
DOI:10.1002/jhet.5570410418
日期:2004.7
droxy-chromen-2-one (2) whose reactions with thiourea, thioacetamide and ammonium dithiocarbamate gave respectively 3-(2-amino-thiazol-4-yl)-4-hydroxy-, 4-hydroxy-3-(2-phenyl-thiazol-4-yl)- and 4-hydroxy-3-(2-mercapto-thiazol-4-yl)chromen-2-one. In a similar manner, com pound 2 was treated with four 1-substituted-2-thioureas and thiobenzamide to give the corresponding 4-hydroxy-3-(thiazol-4-yl)-chromen-2-one
e heterocyclic hybrids has been efficiently synthesized via a one-pot catalyst-free three-componentreaction of α-bromoacetylated pyran-2-one derivatives, thiosemicarbazide, and polysubstituted-1-(1H-pyrazol-4-yl)butane-1,3-diones. This multicomponent procedure has been advantageously applied to prepare a structural diversity of heterocyclic hybrids characterized by extensive 1D and 2D NMR spectroscopic