Reaction of Tröger’s base analogues with Vilsmeier reagents
作者:Qasim M. Malik、Andrew B. Mahon、Donald C. Craig、Andrew C. Try
DOI:10.1016/j.tet.2011.08.095
日期:2011.11
As part of a program aimed at introducing functionality onto the Tröger’s base framework post-synthesis, we investigated the formylation reaction of Tröger’s baseanalogues with Vilsmeier reagents. We found that rather than the anticipated reaction at the aryl rings, these compounds react with Vilsmeier reagents to afford compounds with a modified strap, whereby the apical methylene group is replaced
An efficient one-step synthesis of 4-nitro-N-aryl substituted glutarimides, succinimides and maleimides in polyphosphoric acid is described together with the subsequent reduction to the corresponding anilines. The scope and limitation of this cyclocondensation are presented.
The reactions between anilines and DMSO/HCl produce Troger'sbases in moderate yield. The Troger'sbasesbearing an electron-withdrawing group can also be synthesized through this procedure. In this reaction, DMSO/HClacts as formaldehyde equivalent.
Methods of metal-free synthesis of a compound for catalysis include mixing an aniline of the general structure (1):
with an aldehyde to form a reaction mixture, and performing a synthesis using the reaction mixture. Each instance of R may be independently an electron withdrawing group. The compound is a thioaminal or a Tröger's base. Polymerization catalysts, or mixtures comprising polymerization catalysts, include the general structure (2):
Each instance of R may be independently selected from the group consisting of —H, —F, —CF
3
, —NO
2
, —Cl, —Br, —I, and nitrile. R′ may be linear or branched alkyl.