TiO2 NPs-Coated Carbone Nanotubes as a Green and Efficient Catalyst for the Synthesis of [1]Benzopyrano[b][1]benzopyranones and Xanthenols in Water
作者:Shahrzad Abdolmohammadi
DOI:10.2174/1386207321666181018164739
日期:2018.12.17
research, TiO2-CNTs were used as an efficient recyclable catalyst for the synthesis of [1]benzopyrano[b][1]benzopyran-6-ones and xanthenols by the pseudo three-component reaction of salicylaldehydes with active methylene compounds including 4-hydroxycoumarin (4- hydroxy-2H-1-benzopyran-2-one) or 3,4-methylenedioxyphenol. The introduced method is mild, environmentallybenign and effective to give the
Studies on 4-Hydroxycoumarins. II. The Condensation of Aldehydes with 4-Hydroxycoumarins<sup>1</sup>
作者:William R. Sullivan、Charles F. Huebner、Mark A. Stahmann、Karl Paul Link
DOI:10.1021/ja01252a008
日期:1943.12
Selectivity control in the reaction between 2-hydroxyarylaldehydes and 4-hydroxycoumarin. Antioxidant activities and computational studies of the formed products
作者:Kamilia Ould Lamara、Malika Makhloufi-Chebli、Amina Benazzouz-Touami、Souhila Terrachet-Bouaziz、Nejla Hamdi、Artur M.S. Silva、Jean-Bernard Behr
DOI:10.1016/j.molstruc.2021.129936
日期:2021.5
3-b][1]benzopyran-6-ones 4a-g and 3-(2-hydroxybenzoyl)-2H-chromen-2-ones 5a-g derivatives were synthesized by reaction of 4-hydroxycoumarin with 2-hydroxyarylaldehydes 2a-f or 2-hydroxynaphtaldehyde 2g using different solvents and acid/base catalysts. The approach relies on a regioselective cascade reaction involving one/two molar equiv of the 4-hydroxy coumarin iteratively acting as active methylene substrate