- Facile preparation of 3,4-benzocoumarins from 2-arylbenzoic acids with NCS and NAI
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– Treatment of 2-arylbenzoic acids with N-chlorosuccinimide (NCS) and NaI at 70 °C under fluorescent lighting condition gave the corresponding 3,4-benzocoumarins in good yields under transition-metal-free condition. It was found that the reactivity of NCS
- Nakamura, Momoko,Togo, Hideo
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- Cerium photocatalyzed dehydrogenative lactonization of 2-arylbenzoic acids
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The first cerium photocatalyzed dehydrogenative lactonization of 2-arylbenzoic acids has been developed. This operationally simple protocol allows rapid access to synthetically useful coumarins on gram scale by employing CeCl3 as a photocatalyst and O2 as a terminal oxidant. Overall, this delivers an economical and environmentally amiable entry to diversely substituted coumarins, important structural motifs in bioactive molecules.
- Wadekar, Ketan,Aswale, Suraj,Yatham, Veera Reddy
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supporting information
p. 983 - 987
(2020/02/15)
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- Palladium-Catalyzed Direct Annulation of Benzoic Acids with Phenols to Synthesize Dibenzopyranones
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Direct annulation of benzoic acids with phenols via palladium-catalyzed oxidative coupling is reported. Readily available and inexpensive starting materials were used in this novel method to synthesize highly valuable and useful dibenzopyranone scaffolds.
- Wang, Yang,Gu, Jie-Yu,Shi, Zhang-Jie
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supporting information
p. 1326 - 1329
(2017/03/23)
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- General and practical carboxyl-group-directed remote C-H oxygenation reactions of arenes
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Two methods for remote aromatic C-H oxygenation reactions, have been developed. Method1, the Cu-catalyzed oxygenation reaction, is highly efficient for cyclization of electron-neutral and electron-rich biaryl carboxylic acids into 3,4-benzocoumarins. Method2, the K2S2O 8-mediated oxygenation reaction, is more general and practical for cyclization of substrates with electron-donating and -withdrawing groups (see scheme). Copyright
- Wang, Yang,Gulevich, Anton V.,Gevorgyan, Vladimir
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p. 15836 - 15840
(2014/04/03)
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- Reactions of gas-phase phenanthrene under simulated atmospheric conditions
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Rate constants for the gas-phase reactions of phenanthrene with OH radicals, NO3 radicals, and O3 have been determined at 296 ± 2 K and atmospheric pressure of air. The rate constants obtained (in cm3 molecule- 1 s-1 units) were (1.27 ± 0.23) x 10-11 for the OH radical reaction, (1.2 ± 0.4) x 10-13 for the NO3 radical reaction under atmospheric conditions, and (4.0 ± 1.0) x 10-19 for the O3 reaction. These rate constants indicate that the OH radical and NO3 radical reactions will be the dominant atmospheric loss processes for phenanthrene and that the overall atmospheric lifetime of gas-phase phenanthrene will be ≤1 day. Mutagenicity bioassays and chemical analyses of the products of the NO3 radical reaction and NO(x)-air photooxidation of phenanthrene were also conducted.
- Kwok,Harger,Arey,Atkinson
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p. 521 - 527
(2007/10/03)
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- S(RN)1C-arylation of phenols by azosulfides: A novel synthesis of dibenzo[b,d]pyran-6-ones
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The ortho-arylation of phenols by (2-cyanoaryl)azo t-butyl (or phenyl) sulfides in S(RN)1 conditions, followed by a silica-gel-catalysed lactonisation of the resulting 2-cyano-2'-hydroxybiphenyls, leads to dibenzo[b,d]pyran-6-ones.
- Petrillo,Novi,Dell'Erva,Tavani
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p. 9297 - 9304
(2007/10/02)
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