Selective synthesis of trisubstituted pyrroles through the reactions of alkynyl Fischer carbene complexes with oxazolones
作者:Julio López、Iván Velazco-Cabral、Eloy Rodríguez-deLeón、Clarisa Villegas Gómez、Francisco Delgado、Joaquín Tamariz、Ana Arrieta、Fernando P. Cossío、Miguel A. Vázquez
DOI:10.1039/c9ob02411e
日期:——
An efficient and simple synthesis of novel trisubstituted 1H-pyrroles 4a-qvia 1,3-dipolar cycloaddition of Δ3-trifluoromethyloxazolones 2a-d with both chromium and tungsten alkynyl Fischercarbenecomplexes (1a-h) is described. An unexpected and unreported -CF3 group elimination process was observed in the pyrrole structure. Our experimental and theoretical data suggested that the metal fragment may
immobilized oxazolones in combination with difunctional nucleophiles as cleavage agent is presented. The scope of the novel method has been demonstrated through subsequent modification of the parent oxazolone scaffold on solid supports using conversions with electrophiles or CuAAC reactions to give functionalized pyrazin-2-ones. The described method allows the synthesis of the target heterocycles in good
Process for the preparation of insecticidal, acaricidal and nematicidal
申请人:American Cyanamid Company
公开号:US05030735A1
公开(公告)日:1991-07-09
There is provided a process for the preparation of 2-aryl-5-(trifluoromethyl)pyrrole compounds which are useful as insecticidal, acaricidal and nematicidal agents.
提供一种制备2-芳基-5-(三氟甲基)吡咯类化合物的方法,该化合物可用作杀虫剂、杀螨剂和杀线虫剂。
A convenient synthesis of 2-trifluoromethylpyrroles via base-promoted cyclocondensation of trifluoromethyloxazolones with electron-deficient alkenes
The cyclocondensation of trifluoromethyloxazolones with electron-deficient alkenes in the presence of base gives 2-trifluoromethylpyrroles and related heterocyclic compounds in good yields; the reaction involves the tandem Michael addition of trifluoromethyloxazotes to electron-deficient alkenes, intramolecular cyclization and decarboxylation.