Heterocyclic Building Blocks-Oxazolidine

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Poly(N-vinylimidazole) as an efficient and recyclable catalyst of the aza-Michael reaction in water

Poly(N-vinylimidazole) effectively catalyzed Michael addition of 1H-1,2,4-triazole, 3,5-dimethyl-1H-1,2,4-triazole, uracil, oxazolidin-2-one, and succinimide to but-3-en-2-one, cyclohex-2-en-1-one, methyl acrylate, and methyl vinyl sulfone in water at room temperature. The catalyst can readily be regenerated and repeatedly used at least five times without loss in activity, as shown in the reaction of 1H-1,2,4-triazole with but-3-en-2-one as an example.

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Predictable and regioselective insertion of internal unsymmetrical alkynes in rhodium-catalyzed cycloadditions with alkenyl isocyanates

A regioselective, rhodium-catalyzed cycloaddition between a variety of internal, unsymmetrical alkynes is described. We document the impact of both steric and electronic properties of the alkyne on reaction course, efficiency, and enantioselectivity. The substituent that better stabilizes a positive charge or the larger group, all else being equal, inserts distal to the carbonyl moiety in a predictable and controllable fashion. The reaction scope is broad and the enantioselectivities are high, providing an “instruction manual” for substrate choice when utilizing this reaction as a synthetic tool.

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Synthesis of azachrysenes and multi-nitrogenated derivatives

Azachrysenes are aromatic tetracyclic structures where one carbon atom is replaced by nitrogen in any symmetrically distinct position of the fused aromatic ring. They can be considered analogs of azasteroids, with recognized potential as drug candidates. The present review surveys the work carried out over the last three decades on the synthesis of mono-, di-, tri- and penta-azachryzene derivatives. Although a diversity of synthetic approaches were described in the literature, there are no recent review articles on this subject.

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KCC-1 Supported Ruthenium-Salen-Bridged Ionic Networks as a Reusable Catalyst for the Cycloaddition of Propargylic Amines and CO2

Abstract: This study investigates the potential application of an efficient, easily recoverable and reusable KCC-1 nanoparticle-supported Salen/Ru(II) catalyst in the synthesis of 2-oxazolidinones from CO2, and propargylic amines. The KCC-1/Salen/Ru(II) NPs were thoroughly characterized by using TEM, SEM, TGA, FT-IR, ICP-MS, and BET. This observation was exploited in the direct and selective chemical fixation of CO2, affording high degrees of CO2 capture and conversion. The recycled catalyst has been analyzed by ICP-MS showing only minor changes in the morphology after the reaction, thus confirming the robustness of the catalyst.

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Studies toward asymmetric synthesis of leiodelide A

An enantioselective route for oxazoline 4, a key fragment toward the asymmetric synthesis of leiodelide A, is described. We synthesized northern subunit 6 through a Julia-Lythgoe olefination and subsequent Sharpless asymmetric dihydroxylation. Moreover, a highly diastereoselective method using well-established Evans’ asymmetric aldol condensation was developed for preparation of southern fragment 5. The additional feature of this synthetic route is the formation of oxazoline 4 through DAST-promoted cyclization of the amidation product from subunits 5 and 6.

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Oxazolidine | C3H2668NO – PubChem

 

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Delta4-Oxazolin-2-ones and process therefor

Compounds having the formula STR1 wherein R is hydrogen or an acyl radical are prepared by chlorinating 3-acyl-oxazolidin-2-ones, followed by dehydrochlorination and optionally by saponification and reacylation. The compounds are useful as starting material for substitution and addition reactions and as vinyl monomers in homo- and copolymerizations, whereby oxazolidin-2-one rings containing polymers are formed. These polymers can be used as antistatic agents, dyeing auxiliaries and ion exchangers.

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Reference of 95715-86-9, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.95715-86-9, Name is Methyl (R)-N-Boc-2,2-dimethyloxazolidine-4-carboxylate, molecular formula is C12H21NO5. In a Patent£¬once mentioned of 95715-86-9

COMBINATIONS OF HEPATITIS C VIRUS INHIBITORS

The present disclosure is generally directed to antiviral compounds, and more specifically directed to combinations of compounds which can inhibit the function of the NS5A protein encoded by Hepatitis C virus (HCV), compositions comprising such combinations, and methods for inhibiting the function of the NS5A protein.

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Oxazolidine – Wikipedia,
Oxazolidine | C3H2471NO – PubChem

 

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One pot synthesis of 2-oxazolidinone derivatives

The invention provides an improved process for preparing compounds of formula (I) STR1

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A new regio- and stereoselective synthesis of beta-enamino ketones with 3-ethoxycyclobutanones and substituted amines

A new method toward regio- and stereoselective synthesis of beta-enamino ketones is described. Through Lewis acid-catalyzed reactions between 3-ethoxycyclobutanones and substituted amines, a variety of cis and trans beta-enamino ketone derivatives were prepared with complete regio- and stereoselectivity at room temperature.

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Oxazolidine | C3H762NO – PubChem

 

Reference of 497-25-6, Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 497-25-6, molcular formula is C3H5NO2, introducing its new discovery.

Bronsted base-modulated regioselectivity in the aerobic oxidative amination of styrene catalyzed by palladium

Palladium(II)-catalyzed aerobic oxidative amination of styrene with oxazolidinone proceeds with catalyst-controlled regioselectivity: (CH 3CN)2PdCl2 (1) and (Et3N) 2PdCl2 (2) catalyze formation of the anti-Markovnikov and Markovnikov enecarbamate products, 3 and 4, respectively. Kinetic studies and deuterium kinetic isotope effects demonstrate that these two reactions possess different rate-limiting steps, and the data indicate that the product regiochemistry arises from the presence or absence of an effective Bronsted base in the reaction. In the presence of a Bronsted base such as triethylamine or acetate, the kinetically preferred Markovnikov aminopalladation adduct of styrene is trapped via rapid deprotonation of a zwitterionic intermediate and leads to formation of 4. In the absence of an effective Bronsted base, however, slow deprotonation of this adduct enables aminopalladation to be reversible, and product formation proceeds through the thermodynamically preferred anti-Markovnikov aminopalladation adduct to yield 3.

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