Effective Synthesis oftert-Butyl-Substituted 3-Carboxy Coumarins in Water Using TEBAC as Catalyst
摘要:
A facile synthesis of novel tert-butyl substituted 3-carboxycoumarin derivatives is described, featuring the one-pot reaction of tert-butyl substituted salicylaldehydes with Meldrum's acid in water using triethylbenzyl ammonium chloride (TEBAC) as catalyst.
Catalyst‐ and Additive‐Free Decarboxylative C‐4 Phosphorylation of Coumarin‐3‐Carboxylic Acids at Ambient Conditions
作者:Goutam Brahmachari
DOI:10.1002/adsc.202001054
日期:2020.12.8
practical and green synthetic strategy for decarboxylative C‐4 phosphorylation of coumarin‐3‐carboxylic acids, for the first time, has been accomplished to access a series of substituted 4‐(diarylphosphoryl)chroman‐2‐ones at ambient conditions. The developed protocol is successfully applied to large‐scale synthesis.
Visible Light-Driven Reductive Azaarylation of Coumarin-3-carboxylic Acids
作者:Ewelina Kowalska、Angelika Artelska、Anna Albrecht
DOI:10.1021/acs.joc.2c00683
日期:2022.8.5
In the manuscript, reductive and decarboxylative azaarylation of coumarin-3-carboxylic acids is described. It utilizes the photocatalytic activation of (cyano)azaarenes in the presence of fac-Ir(ppy)3 as a photocatalyst. The methodology is versatile and provides access to biologically relevant 4-substituted-chroman-2-ones. Visible light, photoredox catalyst, base, anhydrous solvent, and inert atmosphere
PhI(OAc)
<sub>2</sub>
/I
<sub>2</sub>
‐Mediated Decarboxylative C
<sub>4</sub>
‐Amination of Coumarin‐3‐Carboxylic Acids via C
<sub>
<i>sp2</i>
</sub>
−H Dehydrogenative C−N Cross‐Coupling under Ambient Conditions
作者:Anindita Bhowmick、Goutam Brahmachari
DOI:10.1002/ejoc.202300192
日期:——
PIDA/I2-mediated decarboxylative C4-amination of coumarin-3-carboxylic acids was achieved via direct Csp2−H dehydrogenative C−N cross-coupling with secondary amines under ambient conditions.
C(sp)–C(sp<sup>3</sup>) Bond Formation through Ligand- and Additive-Free CuO-Mediated Decarboxylative Direct Cross-Coupling of Coumarin-/Chromone-3-carboxylic Acids and Terminal Alkynes
作者:Anindita Bhowmick、Goutam Brahmachari
DOI:10.1021/acs.orglett.3c02369
日期:2023.10.6
A practical and efficient method for the synthesis of functionalized 4-(aryl-/heteroaryl-ethynyl)chroman-2-ones and 2-(aryl-/heteroaryl-ethynyl)chroman-4-ones through copper-catalyzed decarboxylative direct cross-coupling of coumarin-/chromone-3-carboxylic acids with terminal alkynes, leading to the formation of C(sp)–C(sp3) bonds, has been unearthed. Advantages of this protocol include avoidance of
Effective Synthesis of<i>tert</i>-Butyl-Substituted 3-Carboxy Coumarins in Water Using TEBAC as Catalyst
作者:Yang Li、Wentao Gao
DOI:10.1080/00397911.2011.552153
日期:2012.7.15
A facile synthesis of novel tert-butyl substituted 3-carboxycoumarin derivatives is described, featuring the one-pot reaction of tert-butyl substituted salicylaldehydes with Meldrum's acid in water using triethylbenzyl ammonium chloride (TEBAC) as catalyst.