Results 101 to 110 of about 281,828 (139)

Harnessing Rhodium-Catalyzed C-H Activation: Regioselective Cascade Annulation for Fused Polyheterocycles.

The Journal of Organic Chemistry, 2021
In the realm of transition-metal catalyzed arene functionalization, rhodium(III) catalysis is considered as exemplary due to its propensity to activate C-H bonds to obtain comprehensive molecular assembly.
Maneesh Kumar Reddy Singam, Undamatla Suri Babu, Attunuri Nagireddy, J. Nanubolu, Maddi Sridhar Reddy   +4 more
semanticscholar   +4 more sources

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Synthesis of androstane derivatives fused with polyheterocycles at the D ring

Mendeleev Communications, 2023
Leonid G Menchikov, Igor V Zavarzin
exaly   +3 more sources

Five-Membered Fused Polyheterocycles

, 2020
N. Kaur
semanticscholar   +3 more sources

Oxidative sp3 C–H Functionalization of Methyl Substituted Aza‐Aromatics: An Easy Access to N‐Fused Polyheterocycles

European Journal of Organic Chemistry, 2019
Bhima Sridevi, Satheeshkumar Reddy Kandimalla, B V Subba Reddy   +2 more
exaly   +3 more sources

Improved synthesis of 2,3-disubstituted pyridines by metallation of 2-chloropyridine: a convenient route to fused polyheterocycles

Journal of the Chemical Society Perkin Transactions 1, 1990
Chemoselective directed metallation of 2-chloropyridine allows the synthesis of 2-substituted 3-carbonylated pyridines, advantage being taken of the metallation ortho-directing effect of the halogen, as well as its reactivity towards nucleophiles. Thus (2-chloro-, 2-methoxy-, and 2-amino-3-pyridyl)-ethanones and -arylmethanones as well as carbaldehydes
François Trécourt, F Marsais
exaly   +4 more sources

Pd/P/dba-Promoted cascade annulations to produce fused medium-sized sulfoximine polyheterocycles

Organic Chemistry Frontiers, 2019
The Pd-catalyzed multicomponent reactions of NH-sulfoximine, aryl iodide and norbornadiene (NBD) are reported to chemoselectively produce fused medium-sized sulfoximine polyheterocycles in good to excellent yields.
Zhiyuan Chen
exaly   +3 more sources

Six-membered fused N-polyheterocycles

, 2020
N. Kaur
semanticscholar   +3 more sources

Synthesis of Potentially Biologically Active Fused Polyheterocycles Containing a Pyrimidine Unit

Russian Journal of Organic Chemistry, 2019
A number of new fused polyheterocyclic compounds were synthesized on the basis of 2-amino-6-sulfanylpyrirnidin-4(3H)-one. In particular, reactions of 2-amino-6-suffanylpyrirnidin-4(3H)-one with cinnamic acids, aroyl isothiocyanate, and acetic anhydride afforded imidazo[1,2-a]thieno[2,3-d]pyrimidine, [1,3]thiazino[6′,5′: 4,5]pyrimido[1,2-a][1,3,5 ...
M. Soliman, M. El-Ahwany, M. Sherif, M. Assy   +3 more
semanticscholar   +2 more sources

ChemInform Abstract: Synthetic Routes to Benzimidazole‐Based Fused Polyheterocycles

ChemInform, 2011
AbstractReview: 156 refs.
Kamal M. Dawood, Bakr F. Abdel‐Wahabb
openaire   +2 more sources

An efficient domino Knoevenagel/hetero-Diels–Alder route to some novel thiochromenoquinoline-fused polyheterocycles

Monatshefte für Chemie - Chemical Monthly, 2014
The 2-alkenylthiopyranoquinoline-3-carbaldehyde derived from 2-mercaptoquinoline-3-carbaldehyde and citral underwent smooth domino Knoevenagel/hetero-Diels–Alder reaction with heterocyclic mono- or diketones in tetrabutylammonium hydrogensulfate under solvent-free conditions and afforded a new class of thiochromenoquinoline-fused heterocycles in good ...
N. Parmar, Balvantsingh M. Labana, H. A. Barad, R. Kant, V. Gupta   +4 more
semanticscholar   +3 more sources