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This work presents the most in-depth findings on the mechanism of oxidative enolate coupling to date. The scope of oxidative enolate heterocoupling is extensive 40 examples and has been shown to be efficient even on a large scale gram-scale or greater. Finally, the method has been applied to the total synthesis of the unsym. C-N reductive elimination gave the corresponding succinimides, which could be readily converted to 1,4-dicarbonyl compds.
This method was found to be effective with substrates contg. Oxidative coupling of enolates, enol silanes, and enamines: methods and natural product synthesis. A review.
Oxidative coupling of enolates, enol silanes, and enamines provides a direct method for the construction of useful 1,4-dicarbonyl synthons.
Despite its first being reported in , with subsequent important advances beginning in the s, the development of this powerful reaction into a reliable methodol. In recent years, though, there have been a no. This microreview summarizes these new advances in methodol. Catalytic asymmetric dearomatizing redox cross coupling of ketones with aryl hydrazines giving 1,4-diketones.
Bronsted acid catalyzed dearomatizing redox cross coupling reaction has been realized, in which aryl hydrazines react with ketones to deliver 1,4-diketones, bearing an all-carbon quaternary stereocenter in high enantiopurity [e.
Stereodivergent synthesis of 1,4-dicarbonyls by traceless charge-accelerated sulfonium rearrangement. Science , , — , DOI: American Association for the Advancement of Science. The chem. The prepn. By contrast, a general enantioselective access to quaternary stereocenters in acyclic 1,4-dicarbonyl systems remains an unresolved problem, despite the tremendous importance of 2,3-substituted 1,4-dicarbonyl motifs in natural products and drug scaffolds. Here we present a broad enantioselective and stereodivergent strategy to access acyclic, polysubstituted 1,4-dicarbonyls via acid-catalyzed [3,3]-sulfonium rearrangement starting from vinyl sulfoxides and ynamides [e.
The stereochem. A strategy for the convergent and stereoselective assembly of polycyclic Molecules. The stereoselective oxidative coupling of cyclic ketones via silyl bis-enol ethers followed by ring-closing metathesis is shown to be a general and powerful reaction sequence for the prepn. The modular strategy successfully constructs substructures prevalent in numerous bioactive natural product families, varying in substitution and carbocyclic compn.
Several of the prepd. Oxidative coupling of ketone enolates by ferric chloride. The couplings were relatively insensitive to steric crowding in the enolate.
The structure of dimer I was confirmed by x-ray anal. EtOAc was also dimerized by this method. Synthesis , 11 , — , DOI: Copper catalyzed oxidation of organozinc halides. Su, Xianbin; Fox, David J. Royal Society of Chemistry.
A wide range of organozinc substrates may be oxidized in the presence of catalytic copper to give carbon-carbon bonds in high yield. C-Acylation of cyclopropanols: preparation of functionalized 1,4-diketones. A convenient method for prepg. A Co-catalyzed reaction for the construction of 1,4-dicarbonyls, e. In view of the easy availability of starting materials, wide substrate scope, high functionality tolerance, and operational simplicity, this protocol constituted a simple, practical, and powerful alternative compared with previous approaches.
Palladium-catalyzed C—C bond formation to construct 1,4-diketones under mild conditions. Two of the 1,4-diketones were subjected to the Paal-Knorr reaction to synthesize tetraaryl-substituted five-membered heteroarenes. Tetrahedron Lett. Rhodium enolates were catalytically formed from ketones, which underwent oxidative coupling using an organosulfur reagent.
Copper II -promoted C—C bond formation by oxidative coupling of two C sp3 -H bonds adjacent to carbonyl group to construct 1,4-diketones and tetrasubstituted furans. A copper II -promoted carbon-carbon bond C-C bond formation from the coupling of two C sp3 -H bonds that are adjacent to a carbonyl group was achieved.
This protocol offers a simple and efficient approach to 2,3-disubstituted 1,4-diketones and tetrasubstituted furans. This method features a wide substrate scope and high functional group tolerance.
Under optimized conditions the synthesis of the target compds. Starting materials included 1,2-diphenylethanone derivs. The title compds. Furan derivs.
A reaction of 1,2-phenylethanone with 2,2,6,6-tetramethylpiperidinyloxy radical i. Silver-catalyzed coupling of two Csp3-H groups and one-pot synthesis of tetrasubstituted furans, thiophenes, and pyrroles. Silver-catalyzed coupling of two Csp3-H groups to form 1,4-diketones have been developed for the first time.
The resultant ketones then undergo cyclization to synthesize tetrasubstituted furans, thiophenes, and pyrroles from benzyl ketone derivs. This highly-efficient synthetic method, which utilizes air as the terminal oxidant and readily accessible starting materials, displays a wide substrate scope and broad functional-group tolerance.
The catalyst, zinc halide, plays an important role in each step. The carbonyl attack for precondensation is accelerated by the catalyst as Lewis acid, and the intermediate zincate promotes the rearrangement by releasing oxygen and bonding with halogen. On the other hand, the allylic halides, which have no carbonyl moiety, were inert to the zinc-catalyzed coupling with tin enolates. The copper halides showed high catalytic activity for the coupling between tin enolates and org.
The reaction with even chlorides proceeded effectively by the catalytic system. The first catalytic direct alkylation of allylic C-H bonds via Pd II -catalysis in the absence of a base is described. Polysubstituted cyclic compds. II, by the intramol. Oxindole synthesis by direct coupling of Csp2-H and Csp3-H centers.
Enantioselective oxidative cross-coupling reaction of 3-indolylmethyl C-H bonds with 1,3-dicarbonyls using a chiral lewis acid-bonded nucleophile to control stereochemistry. A highly enantioselective copper-catalyzed C-H activation-based oxidative coupling reaction of 3-arylmethylindole derivs. The oxidative C-C coupling procedure is a safe, convenient and environmentally benign process, which has broad substrate scope, low catalyst loading, short reaction time, and good yields.
This novel strategy provides an efficient and environmentally friendly way to access diversify optically active C1-alkene tetrahydroisoquinoline derivs. Copper-catalyzed aerobic intramolecular dehydrogenative cyclization of N,N -disubstituted hydrazones through Csp3-H functionalization.
An efficient copper catalyzed aerobic intramol. This intramol. This method provided a complementary, environmentally friendly, and atom-efficient approach to accessing pyrazole derivs. Direct arylation of C sp3 -H bonds in aliphatic amides with diaryliodonium salts in the presence of a Nickel catalyst. A wide variety of functional groups are tolerated in the reaction. The reaction represents the first example of the Ni-catalyzed direct arylation of C sp3 -H bonds with diaryliodonium salts.
Ligand-enabled cross-coupling of C sp3 -H bonds with arylsilanes. Pd II -catalyzed cross-coupling of C sp3 -H bonds with organosilicon coupling partners has been achieved for the first time. The use of a newly developed quinoline-based ligand is essential for the cross-coupling reactions to proceed. Hypoiodite-catalysed oxidative cyclisation of Michael adducts of chalcones with 1,3-dicarbonyl compounds: a facile and versatile approach to substituted furans and cyclopropanes.
Through hypoiodite catalysis, oxidative cyclization of Michael adducts of chalcones with 1,3-dicarbonyl compds. The selective synthesis of major products was achieved depending on the use of different reaction conditions or substrates.
A Rh III -catalyzed addn. This atom-economic reaction proceeded under mild and redox-neutral conditions with a broad substrate scope. This new strategy is highly selective and tolerates a variety of functional groups. Mechanistic investigations into the reaction process are also described in detail.
Many different C sp3 -H bonds in cyclic alkanes, cyclic ethers, and toluene derivs. Mechanistic investigations including the radical reaction process, the main role of various reagents, and the kinetic isotope effect expt. Remote allylation of unactivated C sp3 -H bonds triggered by photogenerated amidyl radicals.
ACS Catal. The allylation reaction is a highly versatile transformation in chem. While many elegant direct C sp2 -H allylation reactions have been developed, the direct allylation of unactivated C sp3 -H bonds is underdeveloped. By applying photoredox catalysis and a [1,5]-HAT process, herein we report a direct allylation of unactivated C sp3 -H bonds.
This photocatalyzed transformation is tolerant of several functional groups in the amide and allylic chloride substrates. Mechanistically, the formation of the title compds.
In addn. Palladium-catalyzed intramolecular cross-coupling of unactivated C sp3 -H and C sp2 -H bonds. The Pd-catalyzed intramol.
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