Síntese de novos alcaloides tropânicos utilizando reações de cicloadição [4+3]

• Autor(a) principal: Mairink, Simone Zinato
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2152
• topic: Alcaloides tropânicos; Reação de cicloadição; Líquido iônico; Tropanic alkaloids; Cycloaddition reaction; Ionic Liquid; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ORGANICA

A major concern for the environment and also human health is the use of large quantities of pesticides worldwide for increasing crop productivity. In seeking to obtain products in small effective and safe doses for humans were synthesized derivatives of methyl 2,4-dimethyl-3-oxa-8-azabicyclo[3.2.1]oct-6- en-8-carboxylate, by the [4+3] cycloaddition reaction between 2,4- dibromopentan-3-one and N-carboxymethylpyrrole. This structural framework is similar to tropanic alkaloids and bears a carbamate group in its structure. Tropanic compounds are known for their pharmacological activities and carbamatos are used mainly in agriculture and have mostly insecticides activities. Seven products were obtained: methyl 2α,4α-dimethyl-6,7-epoxy-3- oxa-8-azabicyclo[3.2.1]octan-8-carboxylate (93%), methyl 2α,4α-dimethyl-6- hydroxy-3-oxa-8-azabicyclo[3.2.1]octan-8-carboxylate (30%), methyl 2α,4α- dimethyl-3-oxa-8-azabicyclo[3.2.1]octan-8-carboxylate (97%), methyl 2α,4α- dimethyl-3-hydroxy-8-azabicyclo[3.2.1]oct-6-en-8-carboxylate (73%), methyl 2α,4α-dimethyl-3-hydroxy-8-azabicyclo[3.2.1]octan-8-carboxylate (75%), methyl 3-acetyl-2α,4α-dimethyl-8-azabicyclo[3.2.1]octan-8-carboxylate (66%) and methyl 3-acetyl-2α,4α-dimethyl-8-azabicyclo[3.2.1]oct-6-en-8-carboxylate (76%). In addition to efforts in obtaining new and potentially active agrochemicals the development of good alternatives to replace traditional organic solvents, such as ionic liquids were studied. For this reason we evaluated the use of these as a solvent in cycloaddition reactions [4+3] between oxyallyl cation and N-carboxymethylpyrrole, a methodology being developed using environmentally friendly solvents.