Electrocyclization of cis-dienals in organic synthesis: a new and versatile synthetic method for the preparation of aryl- and heteroaryl-fused coumarins
作者:Yung-Son Hon、Tze-Wei Tseng、Chia-Yi Cheng
DOI:10.1039/b912887e
日期:——
Benzo-, furo-, thieno-, and pyrido[f]coumarins were prepared by generating the 2H-pyran-2-one moieties from the oxidation of the corresponding 2H-pyran rings, which were formed in situ from the electrocyclization of cis-dienals.
The First Synthesis of Natural Occurring Juncaceae Coumarin, 9-Hydroxy-8-methyl-3H-benzo[f]chromen-3-one, Featuring a One-pot Rearrangement and Aromatization Cascade
The synthesis of benzocoumarins from β‐tetralones has been achieved via two pathways in the first total synthesis of the Juncaceaenatural product, 9‐hydroxy‐8‐methyl‐3H‐benzo[f]chromen‐3‐one, featuring a one‐pot rearrangement and aromatizationcascade.
Synthesis of π‐Expanded Coumarins by Ligand‐Enabled Selective C−H Functionalization
作者:Peng Ren、Zhijie He、Tiantian Xing、Krishna K. Manar、Jessica Sampson、Jian Jin、Long Wang、Brad P. Carrow
DOI:10.1002/adsc.202200468
日期:2022.9.20
a palladium catalyst. The use of an anionic thioether ligand is critical for ensuring the high reactivity of this reaction; it enables low catalyst loadings, mild reaction conditions, and the use of aceticacid as a green solvent. This chemistry is widely applicable to naphthol-based aromaticsubstrates bearing either electron-donating or -withdrawing functional groups.