- Convenient synthesis of benziodazolone: New reagents for direct esterification of alcohols and amidation of amines
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Hypervalent iodine heterocycles represent one of the important classes of hypervalent iodine reagents with many applications in organic synthesis. This paper reports a simple and convenient synthesis of benziodazolones by the reaction of readily available iodobenzamides with m-chloroperoxybenzoic acid in acetonitrile at room temperature. The structure of one of these new iodine heterocycles was confirmed by X-ray analysis. In combination with PPh3 and pyridine, these benziodazolones can smoothly react with alcohols or amines to produce the corresponding esters or amides of 3-chlorobenzoic acid, respectively. It was found that the novel benziodazolone reagent reacts more efficiently than the analogous benziodoxolone reagent in this esterification.
- Postnikov, Pavel S.,Rohde, Gregory T.,Saito, Akio,Shea, Michael T.,Vlasenko, Yulia A.,Yoshimura, Akira,Yusubov, Mekhman S.,Zhdankin, Viktor V.
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- Oxidative Amidation of Amines in Tandem with Transamidation: A Route to Amides Using Visible-Light Energy
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A methodology is reported for preparing amides using amines as an acyl source. The protocol involves the visible-light-promoted oxidative amidation of amines with pyrazole to synthesize N-acyl pyrazoles followed by transamidation. By combining photoredox catalysis with oxoammonium cations in the presence of sodium persulfate as a terminal oxidant, the N-acyl pyrazoles could be prepared efficiently and effectively using blue LEDs. The transamidation step was performed without the need to purify the N-acyl pyrazole intermediate, and a range of amides were generated in good to excellent yields.
- Nandi, Jyoti,Vaughan, Matthew Z.,Sandoval, Arturo León,Paolillo, Joshua M.,Leadbeater, Nicholas E.
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p. 9219 - 9229
(2020/08/14)
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- Integration of co2 reduction with subsequent carbonylation: Towards extending chemical utilization of co2
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Currently, it still remains a challenge to amplify the spectrum of chemical fixation of CO2, although enormous progress has been achieved in this field. In view of the widespread applications of CO in a myriad of industrial carbonylation processes, an alternative strategy is proposed in which CO2 reduction to CO is combined with carbonylation with CO generated ex situ, which affords efficiently pharmaceutically and agrochemically attractive molecules. As such, CO2 in this study was efficiently reduced by triphenysilane using CsF to CO in a sealed two-chamber reactor. Subsequently, palladium-catalyzed aminocar-bonylation, carbonylative Sonogashira coupling of aryl iodides, and rhodium(I)-mediated Pauson–Khand-type reaction proceeded smoothly to yield amides, alkynones, and bicyclic cy-clopentenones, respectively. Furthermore, the formed alkynones can further be successfully converted to a series of heterocycles, for example, pyrazoles, 3a-hydroxyisoxazolo[3,2-a]isoindol-8-(3aH)-one derivatives and pyrimidines in moderate yields. The striking features of this protocol include operational simplicity, high efficiency, and relatively broad application scope, which represents an alternative avenue for CO2 transformation.
- Lang, Xian-Dong,He, Liang-Nian
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- F2 DERIVATIVES AS ANTIBACTERIAL AGENTS
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A compound or its pharmaceutically acceptable salt, as well as a pharmaceutical composition containing that compound or salt dissolved or dispersed in a pharmaceutically acceptable carrier, and a method of using that compound or salt in an antibacterial treatment. A contemplated compound corresponds in structure to structural Formula I or a pharmaceutically acceptable salt of that compound, wherein V is O or NR9, Y is halogen, OR10, C1-C4 hydrocarbyl or NHR10, Z is NR2-X-R1 or CH2-R8, n is 1-6, X is H, S(O)2, C(O), C(O)NR7, C(NH)NR7 or C (O) O, and R1, R2, R7 ' R8, R9 and R10 are defined within. ( l )
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Page/Page column 55; 57-58
(2013/11/05)
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- Pd(ii)-catalyzed decarboxylative cross-coupling of oxamic acids with potassium phenyltrifluoroborates under mild conditions
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A novel Pd-catalyzed decarboxylative cross-coupling of oxamic acids with potassium phenyltrifluoroborates has been realized under mild reaction conditions. This method provides an efficient access to N-mono- or N,N-disubstituted benzamides and benzoates.
- Li, Mingzong,Wang, Cong,Fang, Ping,Ge, Haibo
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supporting information; experimental part
p. 6587 - 6589
(2011/06/25)
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- One-pot synthesis of N-tert-butyl amides from alcohols, ethers and esters using ZnCl2/SiO2 as a recyclable heterogeneous catalyst
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ZnCl2/SiO2 has been found to be an efficient and reusable catalyst for conversion of alcohols, ethers and esters to corresponding amides via the Ritter reaction in high yield. It was found that benzonitrile reacted with tert-butyl acetate faster than the other sources of tert-butyl carbocation.
- Tamaddon, Fatemeh,Tavakoli, Fatemeh
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experimental part
p. 52 - 55
(2011/04/24)
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- A novel approach for the synthesis of aryl amides
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A novel and highly efficient approach for the synthesis of aryl amides in high yields by the reaction of carboxylic acids and isocyanides in methanol at ambient temperature is reported.
- Shaabani, Ahmad,Soleimani, Ebrahim,Rezayan, Ali Hossein
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p. 6137 - 6141
(2008/03/12)
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- A Study on the Activation of Carboxylic Acids by Means of 2-Chloro-4,6-dimethoxy-1,3,5-triazine and 2-Chloro-4,6-diphenoxy-1,3,5-triazine
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Activation of carboxylic function by means of 2-chloro-4,6-disubstituted-1,3,5-triazines 1 and 2 leading to triazine esters was found to be a multistep process with participation of quarternary triazinylammonium salts 3-6 as the intermediates, with the rate of reaction strongly dependent on the structure of the tertiary amine. The studies on alkylation of tertiary amines with CDMT revealed the two-step process AN + DN, and zwitterionic addition product 9 was identified by 1H NMR spectroscopy. Semiempirical modeling of the reaction as well as measured nitrogen and chlorine isotope effects also support this mechanism.
- Kaminski,Paneth,Rudzinski
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p. 4248 - 4255
(2007/10/03)
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