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chemistry, organic (64) 64
chemistry, multidisciplinary (15) 15
chemistry, medicinal (14) 14
convenient synthesis (14) 14
pharmacology & pharmacy (14) 14
pyrazine derivatives (12) 12
1,3-dipolar cycloaddition reaction (11) 11
facile synthesis (9) 9
derivatives (7) 7
1,2-diazepino<3,4-b>quinoxalines (6) 6
organic chemistry, review (6) 6
ring closure reactions (6) 6
5,14-methano-16-oxo-1,5,6-benzoxadiazonino<3,4-b>quinoxalines (5) 5
hydrazine hydrate (5) 5
intramolecular alcoholysis (5) 5
pyridazine derivatives (5) 5
ring contraction (5) 5
acids (4) 4
culture (4) 4
inhibitory-activity (4) 4
k ee chemistry, organic (4) 4
ring transformation (4) 4
spectrum analysis (4) 4
agents (3) 3
antibacterial activity (3) 3
cholesterol - analysis (3) 3
communication (3) 3
extrusion (3) 3
heterocyclic compounds (3) 3
l-homocysteine hydrolase (3) 3
plasmodium-falciparum (3) 3
sulfur (3) 3
1,2-diazepino[3,4-b]quinoxalines (2) 2
agriculture (2) 2
animal husbandry (2) 2
antibacterial agents (2) 2
antimalarial activity (2) 2
antimony (2) 2
biocides, e.g. as disinfectants, as pesticides, as herbicides (2) 2
carbamates (2) 2
chemistry (2) 2
chlorination (2) 2
cycloaddition reactions (2) 2
cyclophosphamide (2) 2
fishing (2) 2
forestry (2) 2
human necessities (2) 2
hunting (2) 2
hydrogen bonding (2) 2
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japan (2) 2
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management (2) 2
metallurgy (2) 2
methylhydrazine (2) 2
n-bromosuccinimide (2) 2
nitrous acid (2) 2
organic chemistry (2) 2
other 6‐membered heterocycles (2) 2
oxidation (2) 2
pest repellants or attractants (2) 2
pharmacology, medicinal chemistry, vaccines, serums (2) 2
plant growth regulators (2) 2
preservation of bodies of humans or animals or plants or partsthereof (2) 2
pyrazole derivatives (2) 2
pyridazino[3,4-b]quinoxalines (2) 2
pyridonecarboxylic acids (2) 2
quinoline derivatives (2) 2
quinoxaline n-oxide (2) 2
relapse (2) 2
rheumatology (2) 2
substitution reactions (2) 2
tautomeric structure (2) 2
tautomerism (2) 2
toxoplasma-gondii (2) 2
trapping (2) 2
trichloroacetic acid (2) 2
triethyl orthoacetate (2) 2
zinc iodide (2) 2
/ (1) 1
1,2-bishydrazinocarbonyl-4-methylquinoline (1) 1
1,8-diazabicyclo[5,4,0]-7-undecene (1) 1
1506 (1) 1
1732 (1) 1
2,3-bisalkoxycarbonylquinoline (1) 1
2-aminopyridine (1) 1
2-arylhydrazonobutanoates (1) 1
2-oxo-1, 2-dihydroquinoxaline-3-carboxamide oxime (1) 1
2-oxo-1,2-dihydroquinoxaline-3-carboxamide oxime (1) 1
2-substituted 4-quinolones (1) 1
3- furo [2, 3-b] quinoxaline (1) 1
3--2-oxo-1,2,3,4-tetrahydroquinoxaline (1) 1
3--2-oxo-1,2-dihydroquinoxaline (1) 1
3-cyano- 2-oxo-1,2-dihydroauinoxaline (1) 1
3-furo[2,3-b]quinoxaline (1) 1
3-hydrazinocarbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxaline (1) 1
4-halogeno-3-methoxycarbonylmethylene-2-oxo-1,2,3,4-tetrahydro quinoxalines (1) 1
4-hydroxyquinoline (1) 1
4-quinolone (1) 1
532 (1) 1
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Journal of Molecular Structure, ISSN 0022-2860, 01/2020, Volume 1199, p. 126960
Various 2-arylhydrazono-4-chloro-3-oxobutanoates - synthesized by the reaction of ethyl 4-chloro-3-oxobutanoate with the 4-substituted benzenediazonium... 
2-Arylhydrazonobutanoates | Equilibrium constant | (E)/(Z)-Hydrazone isomers | Substituent constant
Journal Article
Heterocycles, ISSN 0385-5414, 2015, Volume 91, Issue 1, pp. 1 - 39
This review describes the synthesis, biological activities, and tautomerism of various 4-quinolones together with related compounds including... 
CONVENIENT SYNTHESIS | 2-SUBSTITUTED 4-QUINOLONES | ANALOGS | 4-Quinolone | INHIBITORY-ACTIVITY | CHEMISTRY, ORGANIC | Tautomerism | 1,3-DIPOLAR CYCLOADDITION REACTION | Synthesis | 4-Hydroxyquinoline | Biological Activity | DIELS-ALDER REACTION | ANTIMALARIAL ACTIVITY | TOXOPLASMA-GONDII | DERIVATIVES | ALKALOIDS
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 11/2014, Volume 51, Issue 6, pp. 1821 - 1829
The 4‐quinolones having the urea or carbamate moiety at the 2‐position showed the facile deuterium–hydrogen (D–H) exchange of the 3‐H proton in... 
CHEMISTRY, ORGANIC | DERIVATIVES | Carbamates
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 08/2014, Volume 51, Issue S1, pp. E249 - E254
The 1‐hydrazinocarbonylmethyl‐4‐quinolone‐3‐carboxylate (10) was converted into the 1‐(4‐amino‐1,2,4‐triazol‐3‐ylmethyl)‐4‐quinolone‐3‐carboxylic acid (13),... 
CHEMISTRY, ORGANIC | L-HOMOCYSTEINE HYDROLASE | CULTURE | PLASMODIUM-FALCIPARUM | INHIBITORY-ACTIVITY
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 11/2014, Volume 51, Issue 6, pp. 1720 - 1726
The reaction of the 4‐hydroxyquinoline‐3‐carboxylate 6 with pentaerythritol tribromide gave the 1,1′‐(2‐methylenepropane‐1,3‐diyl)di(4‐quinolone‐3‐carboxylate)... 
CHEMISTRY, ORGANIC | AGENTS | NITROGEN-BRIDGED HETEROCYCLES | ACIDS | DERIVATIVES
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 08/2014, Volume 51, Issue S1, pp. E241 - E248
The 4‐quinolone‐2‐carbohydrazide 6a was converted into 1‐aryl‐3‐(4‐quinolon‐2‐yl)ureas 5a, 5b, 5c, 5d, 5e, 1‐aryl‐3‐(4‐quinolon‐2‐yl)imidazolidine‐2,4‐diones... 
CHEMISTRY, ORGANIC | TOXOPLASMA-GONDII | L-HOMOCYSTEINE HYDROLASE | CULTURE | PLASMODIUM-FALCIPARUM | INHIBITORY-ACTIVITY | Carbamates
Journal Article
Journal of Plankton Research, ISSN 0142-7873, 06/2014, Volume 36, Issue 6, pp. 1403 - 1407
Using fast repetition rate (FRR) fluorometry, we succeeded in measuring the chlorophyll a (Chl a) content and photo-physiological state of symbiotic algae... 
foraminifers | symbiotic algae | chlorophyll fluorescence | photosynthetic activity | FLUORESCENCE | GLOBIGERINOIDES-SACCULIFER BRADY | QUANTUM YIELD | MARINE & FRESHWATER BIOLOGY | OCEANOGRAPHY | PRIMARY PRODUCTIVITY | IN-SITU | PHYTOPLANKTON
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 11/2012, Volume 49, Issue 6, pp. 1323 - 1331
The 4‐quinolone‐2‐carboxylates 4a,b were converted into the 4‐quinolone‐2‐carbohydrazides 5a,b, hydrazones 6,7,10, and related compounds 8,9,11. The... 
CHEMISTRY, ORGANIC | ACIDS | Heterocyclic compounds
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 08/2014, Volume 51, Issue S1, pp. 249 - 254
The 1-hydrazinocarbonylmethyl-4-quinolone-3-carboxylate (10) was converted into the 1-(4-amino-1,2,4-triazol-3-ylmethyl)-4-quinolone-3-carboxylic acid (13),... 
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 05/2008, Volume 45, Issue 3, pp. 717 - 721
Fused tetracycles, 6‐alkyl‐3‐alkoxy‐2‐cyano‐4,5,6a,11‐tetraazabenzo[a]fluorene derivatives (5a,b,c,d,e,f), are synthesized from... 
CHEMISTRY, ORGANIC | RING-CLOSURE | NITRATION
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 03/2012, Volume 49, Issue 2, pp. 288 - 292
The reaction of the 6‐substituted 1‐methyl‐4‐quinolone‐3‐carboxylates 10a, 10b with hydrazine hydrate gave the 3‐carbohydrazides 7a, 7b, respectively, whose... 
CHEMISTRY, ORGANIC | L-HOMOCYSTEINE HYDROLASE | ACIDS | CULTURE | PLASMODIUM-FALCIPARUM | INHIBITORY-ACTIVITY
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 11/2007, Volume 44, Issue 6, pp. 1231 - 1234
The reaction of 7‐chloro‐1‐methylpyridazino[3,4‐b]quinoxalin‐4(1H)‐ones 3a‐5a with sodium methylthiolate gave... 
CONVENIENT SYNTHESIS | CHEMISTRY, ORGANIC | UNACTIVATED ARYL HALIDES
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 03/2005, Volume 42, Issue 2, pp. 249 - 254
The 3‐heteroaryl‐1‐methylpyridazino[3,4‐b]quinoxalin‐4(1H)‐ones 6a‐e were synthesized by the oxidative‐hydrolytic ring transformation of the... 
1,3-DIPOLAR CYCLOADDITION REACTION | CONVENIENT SYNTHESIS | CHEMISTRY, ORGANIC | FACILE SYNTHESIS | 1,2-DIAZEPINO<3,4-B>QUINOXALINES | FURANS
Journal Article
Heterocycles, ISSN 0385-5414, 11/2002, Volume 58, pp. 359 - 369
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 05/2010, Volume 47, Issue 3, pp. 657 - 663
Novel 4‐quinolone‐3‐carboxylates 6,7 and 4‐quinolone‐3‐carboxylic acids 8a, 8b, 9a, 9b, 9c, 10a, 10b, 11a, 11b, 11c were synthesized from... 
CHEMISTRY, ORGANIC | ACIDS | CULTURE
Journal Article
Heterocycles, ISSN 0385-5414, 01/2003, Volume 59, Issue 1, pp. 283 - 291
An excellent tridentate chelate compound for iron(II) ion, 2,3,5,6-(tetrapyridin-2-yl)pyrazine (2), was directly synthesized by aerial oxidation of a... 
CHEMISTRY, ORGANIC | METAL
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 05/1998, Volume 35, Issue 3, pp. 489 - 497
This review summarizes the synthesis of various pyrazoles reported by us and some other research groups in 1981–1989. 
CONVENIENT SYNTHESIS | CHEMISTRY, ORGANIC | RING TRANSFORMATION | SELECTIVE FLUORINATION
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 03/1999, Volume 36, Issue 2, pp. 321 - 332
This review introduces the synthesis of various pyrazoles reported by us and some other research groups during 1989–1998. Some of papers in this review deal... 
PHARMACOLOGICAL PROPERTIES | PYRAZOSULFURON-ETHYL | FACILE SYNTHESIS | RING TRANSFORMATION | HETEROCYCLES | TAUTOMERIC STRUCTURE | CHEMISTRY, ORGANIC | AGENTS | 6-QUINOXALINYLDIHYDROPYRAZOLO<1,5-A>PYRIMIDIN-7-ONES | DERIVATIVES | PYRAZOLO<1,5-A>PYRIMIDINES
Journal Article
Journal of Heterocyclic Chemistry, ISSN 0022-152X, 09/2003, Volume 40, Issue 5, pp. 837 - 843
The reaction of the quinoxaline N‐oxides 7a,b with diethyl ethoxymethylenemalonate gave the 1‐methylpyridazino[3,4‐b]quinoxaline‐4,4‐dicarboxylates 8a,b, whose... 
CHEMISTRY, ORGANIC | SULFUR | RING CONTRACTION | EXTRUSION
Journal Article
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