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N. A. Zhukovskaya E. A. Dikusar V. I. Potkin O. G. Vyglazov 《Chemistry of Natural Compounds》2009,45(2):148-151
Preparative syntheses from anisaldehyde 1 of the anti-isomer of anisaldehyde oxime 2 and anisaldehyde oxime esters 3a-q in 84-93% yields were developed. The structure—aroma correlation of 2 and 3a-q was studied.
Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 131-134, March-April, 2009. 相似文献
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Preparative syntheses of veratraldehydeoxime esters 6–24, available fragrances produced from vanillin (1), in 82–92% yield from veratraldehydeoxime (3) were developed.
Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 558–560, November–December, 2008. 相似文献
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3,5-Disubstituted isoxazolines with an aryl(hetaryl)carboxymethyl group in position 5 have been synthesized. The addition reaction of nitrile oxides to allyl esters of aryl(hetaryl) carboxylic acids occurs regiospecifically with the formation of the 5-substituted isomer. Initial pharmacological screening showed that 5-(4-bromobenzoyloxy)methyl-3-(3,4-dimethoxyphenyl)isoxazoline possesses marked nootropic activity. 相似文献
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Christian Fischer Prof. Dr. Christof Sparr 《Angewandte Chemie (International ed. in English)》2018,57(9):2436-2440
Despite the manifold use of heterocyclic fluorophores, only a fraction of the desired dye diversity can be accessed by contemporary synthetic approaches. Herein, we describe a modular method that converts various carboxylic acid esters directly into a broad spectrum of heteroanthrylium fluorophores. The double addition of heteroatom‐bridged 1,5‐bifunctional organomagnesium reagents to esters leads to the formation of acridinium, xanthylium, and SiR fluorophores after dehydrative acidic work‐up. This one‐step synthetic method provides access to organophotoredox catalysts for dual catalysis with nickel and dyes amenable to fluorescence enhancement. 相似文献
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E. A. Dikusar N. G. Kozlov N. A. Zhukovskaya K. L. Moiseichuk 《Chemistry of Natural Compounds》2004,40(2):180-183
Vanillin and vanillal oximes 2a and 2b were used to prepare the corresponding esters 3a-k, 4a-k, and 5a-c by reaction with acyl chlorides in the presence of pyridine. 相似文献
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Dr. Andreas P. Hring Dennis Pollok Benjamin R. Strücker Vincent Kilian Johannes Schneider Prof.Dr. Siegfried R. Waldvogel 《ChemistryOpen》2022,11(5)
Herein we report a conceptually new non‐decarboxylative electrolysis of carboxylic acids to obtain their corresponding anhydrides as highly valuable reagents in organic synthesis. All carbon atoms of the starting material are preserved in the product in an overall redox‐neutral reaction. In a broad substrate scope of carboxylic acids the anhydrides are generated with high selectivity, which demonstrates the versatility of the developed method. Beneficially, no dehydrating reagents are required in comparison to conventional methods and the synthesis is based on uncritical starting materials using graphite and stainless steel as very inexpensive and eco‐friendly electrode materials. 相似文献
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Dr. Andreas P. Häring Dennis Pollok Benjamin R. Strücker Vincent Kilian Johannes Schneider Prof. Dr. Siegfried R. Waldvogel 《ChemistryOpen》2022,11(5):e202200059
Herein we report a conceptually new non-decarboxylative electrolysis of carboxylic acids to obtain their corresponding anhydrides as highly valuable reagents in organic synthesis. All carbon atoms of the starting material are preserved in the product in an overall redox-neutral reaction. In a broad substrate scope of carboxylic acids the anhydrides are generated with high selectivity, which demonstrates the versatility of the developed method. Beneficially, no dehydrating reagents are required in comparison to conventional methods and the synthesis is based on uncritical starting materials using graphite and stainless steel as very inexpensive and eco-friendly electrode materials. 相似文献
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Ramesh Naik 《合成通讯》2013,43(21):2823-2826
Primary benzyl amines, upon treatment with aq. NaNO2 and appropriate organic acids at 0–5°C, give their respective benzyl esters. 相似文献
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Decarboxylative Conjunctive Cross‐coupling of Vinyl Boronic Esters using Metallaphotoredox Catalysis
Riccardo S. Mega Vincent K. Duong Adam Noble Varinder K. Aggarwal 《Angewandte Chemie (International ed. in English)》2020,59(11):4375-4379
The synthesis of complex alkyl boronic esters through conjunctive cross‐coupling of vinyl boronic esters with carboxylic acids and aryl iodides is described. The reaction proceeds under mild metallaphotoredox conditions and involves an unprecedented decarboxylative radical addition/cross‐coupling cascade of vinyl boronic esters. Excellent functional‐group tolerance is displayed, and application of a range of carboxylic acids, including secondary α‐amino acids, and aryl iodides provides efficient access to highly functionalized alkyl boronic esters. The decarboxylative conjunctive cross‐coupling was also applied to the synthesis of sedum alkaloids. 相似文献
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Direct Transformation of Esters into Arenes with 1,5‐Bifunctional Organomagnesium Reagents 下载免费PDF全文
Achim Link Christian Fischer Dr. Christof Sparr 《Angewandte Chemie (International ed. in English)》2015,54(41):12163-12166
A direct transformation of carboxylic acid esters into arenes with 1,5‐bifunctional organomagnesium reagents is described. This efficient and practical method enables the one‐step defunctionalization of various carboxylic acid esters to prepare benzene, anthracene, tetracene, and pentacene derivatives. A double nucleophilic addition of the 1,5‐organodimagnesium reagent to the ester is followed by an immediate 1,4‐elimination reaction that leads to the direct [5+1] formation of a new aromatic ring. 相似文献
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A. F. Artamonov F. S. Nigmatullina M. T. Aldabergenova B. Zh. Dzhiembaev 《Chemistry of Natural Compounds》2000,36(4):342-344
Mono- and diesters of D-mannite with aromatic acids are synthesized. The structures of the resulting compounds are confirmed by IR spectroscopy, PMR, and
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C NMR. 相似文献