A novel organozinc reagent 4-coumarinylzinc bromide; preparation and application in the synthesis of 4-substituted coumarin derivatives
作者:Reuben D. Rieke、Seung-Hoi Kim
DOI:10.1016/j.tetlet.2011.03.151
日期:2011.6
A novel organozinc reagent, 4-coumarinylzinc bromide, was prepared by the direct oxidative addition of active zinc to 4-bromocoumarin. The resulting organozinc bromide underwent the palladium-catalyzed cross-coupling reactions with a variety of aryl halides and acid chlorides affording the corresponding coupling products in good yields under mild conditions.
Synthesis of 4-acylcoumarins by NHC-catalyzed nucleophilic substitution
作者:Yumiko Suzuki、Asuka Ando、Mizuki Nakagawa
DOI:10.1016/j.tetlet.2018.10.044
日期:2018.11
groups that originate from aromatic aldehydes by NHC-catalyzed umpolung. 4-Acylthiocoumarins and 2-acylquinolin-2-ones were also prepared using this method. These are the first examples of nucleophilicsubstitutions at the β-carbons of enones to afford γ-ketoenones.
Photoredox-Catalyzed Redox-Neutral Decarboxylative C–H Acylations of Coumarins with α-Keto Acid
作者:Bin Sun、Yingying Wang、Jiayin Wang、Maojie Chen、Zhicheng Zhong、Jiayang Wang、Can Jin
DOI:10.1021/acs.orglett.3c00632
日期:——
A novel and green photocatalytic strategy for the synthesis of C-4-acylated coumarins with α-ketoacids and 3-nitrocoumarin has been developed. This operationally simple protocol works under mild reaction conditions, providing convenient access to 4-acyl coumarin derivatives. The control experimental results showed that the nitro radical produced by the cleavage of the C–N bond acts as an electron
KAY, I. T.;GLUE, S. E. J., TETRAHEDRON LETT., 1986, 27, N 1, 113-116
作者:KAY, I. T.、GLUE, S. E. J.
DOI:——
日期:——
A new synthesis of phenyl ketones by intramolecular ‘deoxybenzoylation’ of enols and phenols
作者:I.Trevor Kay、Stephen E.J. Glue
DOI:10.1016/s0040-4039(00)83955-6
日期:1986.1
The phenylcyanocarbamoyl chloride 1 has been used as a benzoyl anion equivalent in an intramolecular process to effect the replacement of the hydroxyl group of enols and phenols by the benzoyl group.