Preparation of Tetrasubstituted 3-Phosphonopyrroles through Hydroamination: Scope and Limitations
摘要:
Phosphonylated pyrroles were obtained by a ZnCl2-catalyzed 5-exo-dig hydroamination of propargylic enamines. These starting compounds were obtained in two steps from commercially available beta-ketophosphonates. The method tolerates a wide variety of substituents at the 1,2- and 5-position of the pyrrole, while further derivatization allows for the introduction of substituents at the 4-position via lithiation or halogenation.
Preparation of Tetrasubstituted 3-Phosphonopyrroles through Hydroamination: Scope and Limitations
摘要:
Phosphonylated pyrroles were obtained by a ZnCl2-catalyzed 5-exo-dig hydroamination of propargylic enamines. These starting compounds were obtained in two steps from commercially available beta-ketophosphonates. The method tolerates a wide variety of substituents at the 1,2- and 5-position of the pyrrole, while further derivatization allows for the introduction of substituents at the 4-position via lithiation or halogenation.
Preparation of Tetrasubstituted 3-Phosphonopyrroles through Hydroamination: Scope and Limitations
作者:Wouter Debrouwer、Thomas S. A. Heugebaert、Christian V. Stevens
DOI:10.1021/jo500139z
日期:2014.5.16
Phosphonylated pyrroles were obtained by a ZnCl2-catalyzed 5-exo-dig hydroamination of propargylic enamines. These starting compounds were obtained in two steps from commercially available beta-ketophosphonates. The method tolerates a wide variety of substituents at the 1,2- and 5-position of the pyrrole, while further derivatization allows for the introduction of substituents at the 4-position via lithiation or halogenation.