Palladium-Phosphinous Acid-Catalyzed Sonogashira Cross-Coupling Reactions in Water.

ChemInform ◽  
2004 ◽  
Vol 35 (51) ◽  
Author(s):  
Christian Wolf ◽  
Rachel Lerebours
Keyword(s):  
Cross Coupling ◽  
Coupling Reactions ◽  
Phosphinous Acid ◽  
Cross Coupling Reactions ◽  
Acid Catalyzed

Sixfold Peripheral Halogenation of Tribenzotriquinacenes: An Alternative Access to Useful TBTQ Building Blocks

Synthesis ◽  
2017 ◽  
Vol 50 (01) ◽  
pp. 175-183 ◽  
Author(s):  
Dietmar Kuck ◽  
Jens Linke ◽  
Natalia Bader ◽  
Jörg Tellenbröker
Keyword(s):  
Microwave Irradiation ◽  
Lewis Acid ◽  
Elevated Temperatures ◽  
Cross Coupling ◽  
Building Blocks ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Electrophilic Bromination ◽  
Acid Catalyzed ◽  
Derivatives Of

Sixfold electrophilic bromination and iodination of the molecular periphery of the bridgehead-tetramethylated tribenzotriquinac­ene (TBTQ) with N-bromosuccinimide (NBS) and N-iodosuccinimide (NIS), respectively, under various conditions was studied to develop an alternative preparative approach to the classical Lewis acid catalyzed bromination. Running these reactions in trifluoroacetic acid either in pure form or with chloroform as a co-solvent at elevated temperatures, or under sonication or microwave irradiation was found to give increasingly fast and efficient conversion of TBTQ to the target hexahalogenated TBTQ derivatives in excellent yields. NIS was found to be markedly more reactive than NBS, whereas N-chlorosuccimide reacted hardly. The new method was applied to the sixfold functionalization of the 4b,8b,12b-tripropyl-12d-methyl-TBTQ analogue to give the corresponding hexabromo and hexaiodo derivatives. Some sixfold C–C cross-coupling reactions of hexahalo derivatives of TBTQ were carried out in excellent yields to enlarge the three spatially orthogonal indane wings of the TBTQ core.

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