Visible-light synthesis of 4-substituted-chroman-2-ones and 2-substituted-chroman-4-ones <i>via</i> doubly decarboxylative Giese reaction
作者:Marek Moczulski、Ewelina Kowalska、Elżbieta Kuśmierek、Łukasz Albrecht、Anna Albrecht
DOI:10.1039/d1ra05914a
日期:——
Doubly decarboxylative, photoredox synthesis of 4-substituted-chroman-2-ones and 2-substituted-chroman-4-ones is described. The reaction involves two independent decarboxylation processes: the first one initiating the cycle and the second completing the process. Visible light, photoredox catalyst, base, anhydrous solvent and inert atmosphere constitute the key parameters for the success of the developed
Silver-Mediated Oxidative Decarboxylative Trifluoromethylthiolation of Coumarin-3-carboxylic Acids
作者:Minghao Li、Jeffrey L. Petersen、Jessica M. Hoover
DOI:10.1021/acs.orglett.6b03806
日期:2017.2.3
organic compounds, in particular heterocycles, is important because of the prevalence of these structures in medicinally and agriculturally relevant molecules. Herein, the silver-mediatedoxidative decarboxylative trifluoromethylthiolation of coumarin-3-carboxylic acids is reported. This methodology utilizes existing carboxylic acid functionalities for the direct conversion to CF3S groups and results in
Doubly Decarboxylative Synthesis of 4-(Pyridylmethyl)chroman-2-ones and 2-(Pyridylmethyl)chroman-4-ones under Mild Reaction Conditions
作者:Jan Bojanowski、Anna Albrecht
DOI:10.3390/molecules26154689
日期:——
The doubly decarboxylative Michael–type addition of pyridylacetic acid to chromone-3-carboxylic acids or coumarin-3-carboxylic acids has been developed. This protocol has been realized under Brønsted base catalysis, providing biologically interesting 4-(pyridylmethyl)chroman-2-ones and 2-(pyridylmethyl)chroman-4-ones in good or very good yields. The decarboxylative reaction pathway has been confirmed
The reaction of coumarin-3-carboxylic acid with benzylic C(sp3)-H bond was established in this paper. A series of 3-benzylcoumarin derivatives were efficiently isolated in moderated to high yield using Cu(OAc)2 as catalyst and TBPB as oxidant.
Facile synthesis of 4-substituted 3,4-dihydrocoumarins via an organocatalytic double decarboxylation process
作者:Shiyong Peng、Lei Wang、Haibing Guo、Shaofa Sun、Jian Wang
DOI:10.1039/c2ob25075f
日期:——
building blocks, have attracted considerable attention due to their various biological activities. Herein, we have documented an efficient and convenient double decarboxylation process for the synthesis of 4-substituted 3,4-dihydrocoumarin in moderate to excellent yields under mild reaction conditions (up to 98%).