Rh(III)-Catalyzed C-H Annulation of Alkenyl- or Arylimidazoles and (Hetero)cyclic 1,3-Dicarbonyl Compounds: A Rapid Access to Imidazo-Fused Polycyclic Compounds.
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DOI: 10.1021/acs.orglett.2c01315
Abstract: A novel strategy for the synthesis of imidazo-fused polycyclic compounds under mild, base-free, and silver-free conditions by a rhodium(III)-catalyzed C-H annulation of alkenyl or arylimidazoles and (hetero)cyclic 1,3-dicarbonyl compounds is reported here. Such a step-economic… read more here.
Keywords: catalyzed annulation; polycyclic compounds; annulation alkenyl; fused polycyclic ... See more keywords
Gold-catalyzed ring-expansion through acyl migration to afford furan-fused polycyclic compounds.
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DOI: 10.1039/c7cc00218a
Abstract: A gold-catalyzed ring-expansion reaction of alkynones to access furan-fused polycyclic compounds is reported. Mechanistic studies revealed that the reaction might occur through a tandem 1,2-acyl migration/Friedel-Crafts reaction. read more here.
Keywords: ring expansion; furan fused; polycyclic compounds; fused polycyclic ... See more keywords
Asymmetric dearomative cyclopropanation of naphthalenes to construct polycyclic compounds
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DOI: 10.1039/d2sc04509e
Abstract: Catalytic asymmetric dearomatization (CADA) reactions is an important synthetic method for constructing enantioenriched complex cyclic systems from simple aromatic feedstocks. However, the CADA reactions of nonactivated arenes, such as naphthalenes and benzenes, have been far… read more here.
Keywords: cyclopropanation naphthalenes; naphthalenes construct; cyclopropanation; polycyclic compounds ... See more keywords
Linear π-conjugated polycyclic compounds consisting of four-, five-, and six-membered rings: benzo[1′′,2′′:3,4;4′′,5′′:3′,4′]bis(cyclobuta[1,2-c]thiophene)
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DOI: 10.1039/d3ra00144j
Abstract: Linear π-conjugated polycyclic compounds, BBCTs, containing linearly annulated 5-, 4-, 6-, 4-, and 5-membered rings were produced via copper-mediated double intramolecular coupling reactions. The absorption spectra and electrochemical results confirmed their moderate optical energy gaps… read more here.
Keywords: linear conjugated; consisting four; polycyclic compounds; membered rings ... See more keywords
Regioselective synthesis of N-containing polycyclic compounds via radical annulation cyclization of 1,7-dienes with aldehydes.
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DOI: 10.1039/d4cc00964a
Abstract: A convenient method for oxidant-promoted radical cascade acylation or decarbonylative alkylation of 1,7-dienes with aldehydes has been established. This method allows for the rapid construction of N-containing polycyclic skeletons in a highly regio- and stereoselective… read more here.
Keywords: dienes aldehydes; polycyclic compounds; cyclization; containing polycyclic ... See more keywords
Synthesis of π-conjugated polycyclic compounds by late-stage extrusion of chalcogen fragments
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DOI: 10.3762/bjoc.20.30
Abstract: The “precursor approach” has proved particularly valuable for the preparation of insoluble and unstable π-conjugated polycyclic compounds (π-CPCs), which cannot be synthesized via in-solution organic chemistry, for their improved processing, as well as for their… read more here.
Keywords: chemistry; chalcogen fragments; conjugated polycyclic; polycyclic compounds ... See more keywords