Formation of β-(diphenylphosphoryl)pyrroles via reactions of dibromocyclobutenylphosphine oxides with aniline
摘要:
1-Phenyl-2-methyl(phenyl)-4-(diphenylphosphoryl)pyrroles are obtained, unexpectedly instead of the 1-phenyl-4-methyl(phenyl)-2-(diphenylphosphoryl)pyrrole regioisomers from a series of reactions between 1,4-dibromo-2-methyl(phenyl)-4-diphenylphosphorylcyclobutenes and aniline via nucleophilic substitution accompanied by an allylic shift, subsequent retro electrocyclization and pyrrole ring closure. (C) 2013 Elsevier Ltd. All rights reserved.
Formation of β-(diphenylphosphoryl)pyrroles via reactions of dibromocyclobutenylphosphine oxides with aniline
摘要:
1-Phenyl-2-methyl(phenyl)-4-(diphenylphosphoryl)pyrroles are obtained, unexpectedly instead of the 1-phenyl-4-methyl(phenyl)-2-(diphenylphosphoryl)pyrrole regioisomers from a series of reactions between 1,4-dibromo-2-methyl(phenyl)-4-diphenylphosphorylcyclobutenes and aniline via nucleophilic substitution accompanied by an allylic shift, subsequent retro electrocyclization and pyrrole ring closure. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis of brominated allenic, 1-3-butadienyl, and cyclobutenyl diphenylphosphine oxides
作者:A. S. Bogachenkov、B. I. Ionin
DOI:10.1134/s1070363212120195
日期:2012.12
It is known that the halogenation of allenic phosphine oxides leads to the formation of stable phospholene salts [1, 2]. Allenic phosphine oxides are intermediates in the synthesis of cyclobutenyl phosphine oxides [3]. In this work we found that the reaction of the brominated allenic diphenylphosphine oxide I, II with bromine occurs via the intermediate formation of unstable phospholene salts. The