Thermal Rearrangement of<i>N</i>-Alkyl-, and<i>N</i>-Aryl-(2,2-dihalo-1-phenylcyclopropyl)methyleneamines to 1-Alkyl-, and 1-Aryl-2 (or 3)-halo-4-phenylpyrroles
1,3-bond cleavage. The ionic mechanism involving a heterolytic dissociation of chlorine atom under 1,3-bond scission of the cyclopropane ring is proposed for the rearrangement to 3-chloropyrroles, while a homolytic cleavage pathway is proposed for 3-fluoropyrroles. The present thermolysis supplies a unique preparative tool for 2-, and 3-halo-4-phenylpyrrole derivatives.
Manipulated thermal rearrangement of N-t-alkyl-2,2-dichlorocyclopropylimines to N-alkyl-chloropyrroles
作者:Shinzo Kagabu、Itsumi Kawai
DOI:10.1039/c39900001393
日期:——
Thermolysis of N-t-butyl- and N-cumyl-2,2-dichlorocyclopropylimines gives selectively 3-chloropyrroles in polar solvents and 2-chloro derivatives with added base.