Heck arylations with arenediazonium salts: methodological studies and application on bioactive compounds synthesis

Author(s)

Patrícia Prediger

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Instituto de Química
• Defense date: 2012-07-16

Examining board members

Carlos Roque Duarte Correia; Fernando Antonio Santos Coelho; Lucia Helena Brito Baptistella; Adriano Lisboa Monteiro; Timothy John Brocksom

• Advisor: Carlos Roque Duarte Correia

Abstract

The present work was focused in the Heck-Matsuda arylation of several olefins with arenediazonium salts and in the application of the arylated products as intermediates in the syntheses of bioactive compounds. The work is divided in two chapters: 1) Heck-Matsuda reactions between allyl amines and arenediazonium salts and their applications in the synthesis of bioactive compounds, 2) Studies of the Heck-Matsuda reaction in ionic liquids and its application to the synthesis of Cazanucleosides, which are potential antituberculosis compounds. Regarding the first part of this work, a comprehensive methodology for the Heck-Matsuda reaction between allylamines and arenediazonium salts was developed. Several allyl amines derivatives and differents arenediazonium salts were sucessfully employed. Both electron donating and withdrawing groups, as well as bulky substituents, were well tolerated in the diazonium salt. In all cases good to excellent yields and high regio- and stereoselectivities in favor of the ¿×-trans arylated products were obtained. Additionally, some of the adducts prepared by this highly selective Heck reaction were employed as intermediates in the total synthesis of the bioactive compounds naftifine, abamine, abamine SG, alverine and cinacalcet hydrochloride. The second part of this work adressed the Heck-Matsuda reaction between allylic phthalimide and arenediazonium salts in ionic liquids. Under the investigated conditions, the yields and selectivities were similar to those previous achieved with the conventional solvent benzonitrile. In addition, we evaluated the in situ generation of the 4-fluorbenzenediazonium hexafluorophosphate salt in [bmim][PF6], followed by the Heck-Matsuda reaction in a one pot procedure. Finally, we carried out the synthesis of two C-azanucleosides using the Heck-Matsuda reaction with an endocyclic enecarbamate as the key step. As a further development of this work, these compounds will be evaluated regarding their potential antituberculosis activity by Professor Mourey's research group in Toulouse, France (AU)