Rh(III)-Catalyzed [4 + 2] Annulation of Indoles with Diazo Compounds: Access to Pyrimido[1,6-a]indole-1(2H)-ones
摘要:
The Rh(III)-catalyzed regioselective C2-H bond carbenoid insertion/cyclization of N-amidoindoles with alpha-acyl diazo compounds has been developed. This method provides a novel approach to 2H-pyrimido[1,6-a]indol-1-ones with a broad range of functional group tolerance. The synthetic utilities of the approach are demonstrated by versatile chemical transformations.
Selective C-2 functionalization of N-protected and free indoles is reported. The ruthenium-catalyzed C-2 activation of indoles provided an easyaccess to cyclopentenylated indoles. Hydroheteroarylated bicyclic motifs were synthesized via iridium-catalyzed C-2 activation of NH indoles. The methodology was extended to different bicyclic adducts such as diaza- or urea-derived bicyclic olefins.
Neutral acylation (protection) of the indole nitrogen: A simple synthesis of indole-1-carboxylates, indole-1-thiocarboxylates and indole-1-carboxamides
作者:John E. Macor、Alison Cuff、Lyndon Cornelius
DOI:10.1016/s0040-4039(99)00352-4
日期:1999.4
A simple synthesis of indole-1-carboxylates, indole-1-thiocarboxylates and indole-1-carboxamides () under neutral conditions is described.
The Rh(III)-catalyzed regioselective C2-H bond carbenoid insertion/cyclization of N-amidoindoles with alpha-acyl diazo compounds has been developed. This method provides a novel approach to 2H-pyrimido[1,6-a]indol-1-ones with a broad range of functional group tolerance. The synthetic utilities of the approach are demonstrated by versatile chemical transformations.
Highly Stereoselective Ruthenium(II)-Catalyzed Direct C2-<i>syn</i>-Alkenylation of Indoles with Alkynes
ruthenium-catalyzed C2-hydroindolation of alkynes has been described. This transformation provides a rapid access to free (N–H) C2-syn-alkenylated indole derivatives with the assistance of copper(II) salts, in which the directing group is removed via a one-pot process.