Mannich reactions of nucleophilic aromatic compounds involving aminals and α-amino ethers activated by chlorosilane derivatives; catalysis by chlorotrimethylsilane

Abstract

Aminals and α-amino ethers afford N,N-dialkylmethyleneammonium salts by reaction with dichloro(dimethyl)- and trichloro(methyl)-silanes, but whereas chlorotrimethylsilane interacts with α-amino ethers to yield iminium salts, the reaction of the latter silane with aminals does not: in situ Mannich reactions may be carried out using these systems, and in the case of the reactions using chlorotrimethylsilane and aminals the reactions can be catalytic with respect to the silane.