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The first example of a heterocyclic aromatic substitution by an N-ylide and the first examples of heteroaromatic halogenations in the presence of N-halosuccinimides using mechanochemical conditions are described. ARKAT USA, Inc.

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Suzuki-Miyaura coupling of heteroaryls is an important method for the preparation of compound libraries for medicinal chemistry and materials research. Although many catalysts have been developed, none of them have been generally applicable to the coupling reactions of heteroaryl chlorides and tosylates at room temperature. We discovered that a catalyst combination of Pd(OAc)2 and XPhos (2-dicyclohexylphosphanyl-2′,4′,6′- triisopropylbiphenyl) could efficiently catalyze these couplings. Besides the choice of catalyst, the use of hydroxide bases in an aqueous alcoholic solvent was essential for fast couplings. These conditions promoted fast release of active catalyst (XPhos)Pd0, and accelerated the transmetalation in the catalytic cycle. Most of the major families of heteroaryl chlorides (31 examples) and tosylates (17 examples) reached full conversion within minutes to hours at room temperature. The method could be easily scaled up for gram-scale synthesis. Furthermore, we examined the relative reactivity of coupling partners in whole reactions. Electron-rich heteroaryl chlorides and tosylates reacted more slowly than electron-deficient ones, in the order of indole, pyrrole < furan, thiophene < pyridine and other six-membered-ring azines. For heteroarylboronic acids, the reactivity ranking was reversed: indole, pyrrole > furan, thiophene > pyridine. Similarly, electron-deficient arylboronic acids were less reactive than electron-neutral and electron-rich ones. The reactivity trends from this study can help to choose appropriate coupling partners for Suzuki reactions.

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Figure presented It has been shown that various pyrido-, quinolino-, pyrazino-, and quinoxalinotetrazoles can be used efficiently as azide components in Cu-catalyzed click reaction with alkynes. This method allows for efficient synthesis of a wide variety of N-heterocyclic derivatives of 1,2,3-triazoles.

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Cobalt complex 2 has been synthesised in which the key features of molybdopterin – a dithiolene ligand on a tetrahydropyrano[2,3-b]pyrazine – are modelled.

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A family of tricarbonyl Re(I) complexes of the formulation fac-[Re(CO) 3(NHC)L] has been synthesized and characterized, both spectroscopically and structurally. The NHC ligand represents a bidentate N-heterocyclic carbene species where the central imidazole ring is substituted at the N3 atom by a butyl, a phenyl, or a mesityl group and substituted at the N1 atom by a pyridyl, a pyrimidyl, or a quinoxyl group. On the other hand, the ancillary L ligand alternates between chloro and bromo. For the majority of the complexes, the photophysical properties suggest emission from the lowest triplet metal-to-ligand charge transfer states, which are found partially mixed with triplet ligand-to-ligand charge transfer character. The nature and relative energy of the emitting states appear to be mainly influenced by the identity of the substituent on the N3 atom of the imidazole ring; thus, the pyridyl complexes have blue-shifted emission in comparison to the more electron deficient pyrimidyl complexes. The quinoxyl complexes show an unexpected blue-shifted emission, possibly occurring from ligand-centered excited states. No significant variations were found upon changing the substituent on the imidazole N3 atom and/or the ancillary ligand. The photochemical properties of the complexes have also been investigated, with only the complexes bound to the pyridyl-substituted NHC ligands showing photoinduced CO dissociation upon excitation at 370 nm, as demonstrated by the change in the IR and NMR spectra as well as a red shift in the emission profile after photolysis. Temperature-dependent photochemical experiments show that CO dissociation occurs at temperatures as low as 233 K, suggesting that the Re-C bond cleaves from excited states of metal-to-ligand charge transfer nature rather than thermally activated ligand field excited states. A photochemical mechanism that takes into account the reactivity of the complexes bound to the pyridyl-NHC ligand as well as the stability of those bound to the pyrimidyl- and quinoxyl-NHC ligands is proposed.

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The invention relates to compound of the formula (I), in which the substituents are as defined in the specification; in free form or in salt form; to its preparation, to its use as medicament and to medicaments comprising it.

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The U.S. Food and Drug Administration approved 18 new drugs that incorporate the cyclopropyl structural motif in the time frame from 2012 to 2018. This review provides an overview of synthetic approaches to these drugs with emphasis on the construction of the cyclopropyl moiety or its incorporation into the key building blocks for assembly of the highlighted drugs. Based on the structural diversity of these drugs, synthetic approaches for the construction and introduction of the cyclopropyl moiety into their structure are diverse and include: cycloalkylation (double alkylation) of CH-acids, catalytic cyclopropanation of alkenes with diazo compounds, the Simmons-Smith reaction, the Corey-Chaykovsky reaction, the Kulinkovich reaction, the Horner-Wadsworth-Emmons reaction, and cycloaddition. In addition, the cyclopropyl structure was also introduced into the drug substance intermediates via simple cyclopropyl-moiety-containing building blocks, such as cyclopropylamine, cyclopropanesulfonamide, cyclopropanecarbonyl chloride, and cyclopropylmagnesium bromide. 1 Introduction 2 Synthesis of Recently Approved Cyclopropyl-Moiety-Containing Drugs 2.1 Cabozantinib 2.2 Trametinib 2.3 Simeprevir 2.4 Ledipasvir 2.5 Olaparib 2.6 Tasimelteon 2.7 Finafloxacin 2.8 Paritaprevir 2.9 Lenvatinib 2.10 Lumacaftor 2.11 Lesinurad 2.12 Grazoprevir 2.13 Glecaprevir 2.14 Ozenoxacin 2.15 Voxilaprevir 2.16 Naldemedine 2.17 Tezacaftor 2.18 Tecovirimat 3 Conclusion.

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The Ni(II) precatalyst (C1) featuring the phosphonite ancillary ligand Phen-DalPhos (L1) was employed in the cross-coupling of (hetero)anilines with (hetero)aryl chlorides and in the diarylation of ammonia with (hetero)aryl chlorides to afford heteroatom-dense di(hetero)arylamines. The PAd2-DalPhos precatalyst C4 provided complementary reactivity in cross-couplings of indoles with (hetero)aryl chlorides. Taken together, the demonstration of room-temperature reactivity within each of the reaction classes examined and the observation of useful chemoselectivity at low loading (?0.5 mol % Ni) and on gram-scale distinguishes C1 and C4 from other metal catalysts (i.e., copper, palladium, nickel, or other) within the field of C-N cross-coupling chemistry.

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This invention encompasses compounds of the formula: STR1 and the pharmaceutically acceptable non-toxic salts thereof wherein R 1, R. sub.2, R 3, R 4 are variables;

X and Y represent hydrogen, halogen, hydroxy or amino substituents, with the proviso that when Y is a hydrogen, halogen, or amino substituent, X is hydroxy; and< P>

W represent aryl groups unsubstituted or substituted with halogen, hydroxy, alkyl, alkoxy or amino groups.

These compounds or prodrugs thereof are highly selective agonists, antagonists or inverse agonists or GaBAa brain receptors or prodrugs thereof and are useful in the diagnosis and treatment of anxiety, sleep, and seizure disorder, overdose with benzodiazepine drugs, and enchancement of memory.

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A new catalyst system for the Pd-catalyzed cross-coupling of organozinc reagents with aryl halides (Negishi coupling) has been developed. This system permits efficient preparation of hindered biaryls (triand tetra-ortho- substituted), functions effectively at low levels of catalyst, and tolerates a wide range of functional groups and heterocyclic substrates. A systematic study of ligand structure was performed and was correlated with catalyst activity.

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