Synthesis of substituted pyrazolo[1,5-a]quinoxalines using the reductive cyclization
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DOI: 10.1007/s11172-020-2986-1
Abstract: New pyrazolo[1,5-a]quinoxalin-4-ones were obtained by reductive cyclization from the corresponding 1-(2-nitroaryl)pyrazole-5-carboxylates. Alternatively, pyrazolo[1,5-a]quinoxalines were prepared from N-hydroxypyrazolo[1,5-a]quinoxalines. read more here.
Keywords: quinoxalines using; reductive cyclization; synthesis substituted; substituted pyrazolo ... See more keywords
Synthesis and biological evaluation of fluorine substituted pyrazolo[4,3-e][1,2,4]triazines as purine analogues
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DOI: 10.1016/j.jscs.2016.11.004
Abstract: Abstract Some more new fluorine substituted pyrazolo[4,3-e][1,2,4]triazine derivatives (2 – 5) , 7 , 10 , 14 , 17 have been synthesized derived from hydrazinolysis of N-acyl/aroyl/dithioic formamido-2,3-dimethyl-1-phenyl-pyrazolo-5-ones which are obtained from 4-aminoantipyrine 1 .… read more here.
Keywords: fluorine substituted; biological evaluation; evaluation fluorine; substituted pyrazolo ... See more keywords
Synthesis of new 2-substituted pyrazolo[5,1-b][1,3]oxazoles via Sonogashira coupling reactions in water
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DOI: 10.1016/j.tet.2017.04.062
Abstract: Abstract New 2-substituted pyrazolo[5,1- b ][1,3]oxazoles are synthesized through the Sonogashira coupling reaction of 2-iodomethyl-6-methylpyrazolo[5,1- b ][1,3]oxazole with terminal alkynes in the presence of a palladium catalyst. This process is carried out in the absence… read more here.
Keywords: synthesis new; water; sonogashira coupling; new substituted ... See more keywords
Synthesis of Fluorine and Phosphorus Compounds Bearing an Amino Pyrimidine-Substituted Pyrazolo[3,4-d]Pyrimidine Moiety as Molluscicidal Agents against Some Snails
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DOI: 10.1080/10406638.2019.1625066
Abstract: Abstract Novel fluorine or phosphorus compounds bearing an aminopyrimidine-substituted pyrazolo[3,4-d]pyrimidine moiety (5–12) were synthesized by the heterocyclization of 1-heteroaryl guanidine 4 with diethyl malonate, followed by reactions with electrophilic phosphorus compounds and/or aromatic 3,5-dinitrobenzoyl chloride… read more here.
Keywords: phosphorus compounds; compounds bearing; pyrimidine; fluorine phosphorus ... See more keywords