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
Metal-free oxidative decarbonylative alkylation of chromones using aliphatic aldehydes
作者:Rongzhen Chen、Jin-Tao Yu、Jiang Cheng
DOI:10.1039/c8ob00720a
日期:——
A decarbonylative alkylation of chromones via radical conjugate addition under metal-free conditions was developed using aliphaticaldehydes as alkylating reagents. A series of 2-tertiary, secondary, and even primary alkylated chromanones were obtained in moderate to excellent yields.
efficient alkylation of β-chloro ketones and their derivatives was achieved by means of domino dehydrochlorination/Mn-enabled radical-based alkyl-alkyl cross-coupling reaction. In situ-generated α,β-unsaturated ketones and their analogues were identified as the reaction intermediates. Known bioactive compounds, such as melperone and azaperone, could be easily prepared from β-chloropropiophenone in two
Synthesis of 2-alkyl-chroman-4-ones <i>via</i> cascade alkylation–dechlorination of 3-chlorochromones
作者:Shunyao Li、Lanfei Zhang、Qian He、Xiaofei Zhang、Chunhao Yang
DOI:10.1039/d1ob00463h
日期:——
An efficient and mild synthetic approach for 2-alkyl-substituted chroman-4-ones via zinc mediated cascade decarboxylative β-alkylation and dechlorination of 3-chlorochromones was developed.