- Expeditious and Efficient ortho-Selective Trifluoromethane-sulfonylation of Arylhydroxylamines
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A metal- and oxidant-free, practical and efficient method for the synthesis of highly versatile and synthetically useful ortho-trifluoromethanesulfonylated anilines from arylhydroxylamines and trifluoromethanesulfinic chloride was developed. This rapid tr
- Liu, Yue,Bai, Songlin,Du, Yuanbo,Qi, Xiangbing,Gao, Hongyin
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supporting information
(2021/12/27)
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- Practical bromination of arylhydroxylamines with SOBr2 towards ortho-bromo-anilides
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A facile approach for synthesizing ortho-bromoanilides from readily available aryhydroxylamines and thionyl bromide is demonstrated in this work. Mild reaction conditions and broad scope of substrates ranging from heterocyclic structures to pharmaceutics-potential motifs are used in the reactions of this paper. Efficient bromination of ortho C–H bonds of the aryhydroxylamines has been achieved. Ortho-bromoanilide products were obtained in good to excellent yields, and model scaled-up reactions of this synthetic approach are shown in this work.
- Du, Yuanbo,Feng, Lei,Gao, Hongyin,Guo, Lirong,Lu, Haifeng,Xi, Zhenguo
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supporting information
(2021/05/19)
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- Preparation, properties and infrared spectral studies of N-(p-ethylphenyl)thiobenzohydroxamic acid
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The preparation of N-(p-ethylphenyl)thiobenzohydroxamic acid and its spectral properties are described in this paper. The preferred conformation of the acid is investigated by both infrared techniques and theoretical calculations at the DFT level. It is f
- Kakkar, Rita,Dua, Amita,Zaidi, Sheza
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p. 1362 - 1369
(2008/09/17)
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- Method for producing 5-substituted-2-acylaminophenols, and 5-alkyl-2-acylaminophenol compound and N-acyl-N-(4-alkyl-phenyl)hydroxylamine compound
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There is disclosed a method for producing 5-substituted-2-acylaminophenols of formula (I), comprising hydrolyzing to partially deacylate a compound of formula (V): ???in formulae (I) and (V), R1represents an aliphatic hydrocarbon group, an aliphatic hydrocarbon oxy group, an aryloxy group, an acylamino group, a disubstituted amino group, or a hydroxyl group; R2represents an acyl group; X1and X2each represent a hydrogen atom or a halogen atom; and R3represents an acyl group. According to the present invention, a method for synthesizing 2-acylaminophenols that uses inexpensive starting materials, has short steps, is environmentally friendly, is high in safety, and is low in cost, is provided.
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- Arylhydroxamic acid N,O-acyltransferase substrates. Acetyl transfer and electrophile generating activity of N-hydroxy-N-(4-alkenyl-, and 4-cyclohexylphenyl)acetamides
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Arylhydroxamic acid N,O-acyltransferase (AHAT) is an enzyme system that is capable of converting many N-arylhydroxamic acids into reactive electrophilic species. As part of an investigation into the influence of the structure of the aryl group upon the ability of N-arylhydroxamic acids to serve as substrates for AHAT, a series of N-hydroxy-N-(4-alkyl-, 4-alkenyl-, and 4-cyclohexylphenyl) acetamides was prepared and evaluated in vitro with partially purified rat and hamster hepatic AHAT. The nature of the 4-substituent markedly influenced the ability of the hydroxamic acids to serve as acetyl donors in the AHAT-catalyzed transacetylation of 4-aminoazobenzene (AAB). As the length of the 4-substituent was increased from methyl to pentyl, the compounds became increasingly more effective substrates. The compounds containing vinyl, propenyl, and 2-methylpropenyl 4-substituents were more effective acetyl donors than the corresponding compounds containing saturated 4-substituents. The three most effective AHAT substrates in the AAB transacetylation assay were N-hydroxy-N-(4-pentylphenyl)- (7), N-hydroxy-N-(4-propenylphenyl)- (10), and N-hydroxy-N-[4-(2-methylpropenyl)phenyl]acetamide (11), each of which was approximately as active as the standard compound, N-hydroxy-4-acetamidobiphenyl (1), with rat hepatic AHAT and approximately 60% as active as 1 with hamster hepatic AHAT. Both 1 and N-hydroxyl-N-(4-cyclohexylphenyl)acetamide (8) were activated by hamster hepatic AHAT to yield electrophilic intermediates that formed adducts with 2-mercaptoethanol. The 2-mercaptoethanol adducts were characterized by mass spectrometry and were identified as 4-phenyl-2-[(2-hydroxyethyl)thio]aniline (22) and 4-cyclohexyl-2-[(2-hydroxyethyl)thio]aniline (21). The structure of compounds 21 and 22 were confirmed by an unambiguous chemical synthesis. Both compounds 1 and 8 irreversibly inactivated hamster hepatic AHAT by a time-dependent process. The results of the inactivation experiments confirmed that 1 inactivates AHAT primarily via a suicide substrate mechanism and revealed that 8 inactivates the enzyme by a process consisting primarily of a pathway in which electrophiles are released into the medium and subsequently react with nucleophiles present on AHAT.
- Mangold,Hanna
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p. 630 - 638
(2007/10/02)
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