Results 121 to 130 of about 281,828 (139)
Some of the next articles are maybe not open access.
, 2020
A series of non-annulated products: trifluoromethylpyrazolone-tethered trisubstituted methane derivatives were synthesized in high yields in acetonitrile solvent catalyzed by NH4OAc via one-pot, three-component reactions of 2-hydroxy-1,4-naphthoquinone ...
Wen-Di Duan +5 more
semanticscholar +1 more source
A series of non-annulated products: trifluoromethylpyrazolone-tethered trisubstituted methane derivatives were synthesized in high yields in acetonitrile solvent catalyzed by NH4OAc via one-pot, three-component reactions of 2-hydroxy-1,4-naphthoquinone ...
Wen-Di Duan +5 more
semanticscholar +1 more source
Russian Journal of Organic Chemistry, 2020
Commercially available p-aminobenzoic acid was used as a precursor for the synthesis of novel fused, non-fused, and spiro polyheterocyclic derivatives bearing indene, imidazole, pyrazole, and/or triazine nucleus via addition to simple and accessible reagents such as ninhydrin, o-phenylenediamine, and carbon disulfide.
E. O. Hamed, M. G. Assy, M. M. Galahom
openaire +1 more source
Commercially available p-aminobenzoic acid was used as a precursor for the synthesis of novel fused, non-fused, and spiro polyheterocyclic derivatives bearing indene, imidazole, pyrazole, and/or triazine nucleus via addition to simple and accessible reagents such as ninhydrin, o-phenylenediamine, and carbon disulfide.
E. O. Hamed, M. G. Assy, M. M. Galahom
openaire +1 more source
Green Chemistry, 2020
Microwave-assisted synthesis of polyheterocyclic-fused quinoline-2-thiones through the annulation of ortho-heteroaryl anilines and CS2 was realized in water without using any catalysts and additives.
Xiao-Yun Li +8 more
openaire +1 more source
Microwave-assisted synthesis of polyheterocyclic-fused quinoline-2-thiones through the annulation of ortho-heteroaryl anilines and CS2 was realized in water without using any catalysts and additives.
Xiao-Yun Li +8 more
openaire +1 more source
Journal of Organic Chemistry
Synthesis of imidazo-fused polyheterocyclic molecular frameworks, viz. imidazo[1,2-a]pyrrolo[3,4-e]pyridines, imidazo[2,1-a]pyrrolo[3,4-c]isoquinolines, and benzo[g]imidazo[1,2-a]quinoline-6,11-diones, has been achieved by the ruthenium(II)-catalyzed [4 +
Neha Meena +4 more
semanticscholar +1 more source
Synthesis of imidazo-fused polyheterocyclic molecular frameworks, viz. imidazo[1,2-a]pyrrolo[3,4-e]pyridines, imidazo[2,1-a]pyrrolo[3,4-c]isoquinolines, and benzo[g]imidazo[1,2-a]quinoline-6,11-diones, has been achieved by the ruthenium(II)-catalyzed [4 +
Neha Meena +4 more
semanticscholar +1 more source
Organic Letters, 2019
A dehydrogenative annulation of 2-arylindazoles with maleimides for the switchable synthesis of indazolo[2,3-a]pyrrolo[3,4-c]quinolinones or spiroindolo[1,2-b]indazole-11,3'-pyrrolidinones is presented. Mechanistically, the formation of the title compounds involves a Rh(III)-catalyzed C-H metalation of 2-arylindazole, followed by maleimide insertion ...
Chenhao Guo +5 more
openaire +2 more sources
A dehydrogenative annulation of 2-arylindazoles with maleimides for the switchable synthesis of indazolo[2,3-a]pyrrolo[3,4-c]quinolinones or spiroindolo[1,2-b]indazole-11,3'-pyrrolidinones is presented. Mechanistically, the formation of the title compounds involves a Rh(III)-catalyzed C-H metalation of 2-arylindazole, followed by maleimide insertion ...
Chenhao Guo +5 more
openaire +2 more sources
Organic & Biomolecular Chemistry, 2019
An efficient base catalysed synthesis of pyran fused benzimidazothiazoles by a multicomponent route starting from ω-2-benzimidothioacetophenone, an aromatic aldehyde and malononitrile is described.
Arumugam Mariappan +3 more
openaire +2 more sources
An efficient base catalysed synthesis of pyran fused benzimidazothiazoles by a multicomponent route starting from ω-2-benzimidothioacetophenone, an aromatic aldehyde and malononitrile is described.
Arumugam Mariappan +3 more
openaire +2 more sources
Organic Letters, 2022
A copper-catalyzed decarboxylative cascade cyclization of propargylic cyclic carbonates/carbamates with pyridinium 1,4-zwitterionic thiolates is developed. A range of fused polyheterocyclic compounds are obtained in moderate to good yields with excellent diastereoselectivities. Of particular note is that four new bonds (two C-C, one C-O/N, one C-S) and
Ting-Ting Li +6 more
openaire +2 more sources
A copper-catalyzed decarboxylative cascade cyclization of propargylic cyclic carbonates/carbamates with pyridinium 1,4-zwitterionic thiolates is developed. A range of fused polyheterocyclic compounds are obtained in moderate to good yields with excellent diastereoselectivities. Of particular note is that four new bonds (two C-C, one C-O/N, one C-S) and
Ting-Ting Li +6 more
openaire +2 more sources
Organic and biomolecular chemistry, 2023
Tetrahydroisoquinoline and its fused polyheterocycles are prevalent structural motifs found in numerous natural products. In this study, we report a highly efficient and convergent synthetic approach for the construction of tetrahydroisoquinoline-fused ...
Shiqi Liu +4 more
semanticscholar +1 more source
Tetrahydroisoquinoline and its fused polyheterocycles are prevalent structural motifs found in numerous natural products. In this study, we report a highly efficient and convergent synthetic approach for the construction of tetrahydroisoquinoline-fused ...
Shiqi Liu +4 more
semanticscholar +1 more source
Synthesis of enantiomerically pure fused polyheterocyclic glycolurils based on (S)- α-amino acids
Mendeleev Communications, 2007The synthesis of tetra- and pentacyclic fused heterocyclic systems based on the condensation of ( S )-α-amino acids with achiral 2,4,6,8-tetra(hydroxymethyl)- and 1,5-butano-2,4,6,8-tetra(hydroxymethyl)glycolurils has been developed.
Il’ya E. Chikunov +2 more
openaire +1 more source
ChemInform, 2008
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Il'ya E. Chikunov +2 more
openaire +1 more source
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Il'ya E. Chikunov +2 more
openaire +1 more source