Carbon-Carbon Bond Formation by the Use of Chloroiodomethane as a C<sub>1</sub>Unit. III. A Convenient Synthesis of the Mannich Base from Enol Silyl Ether by a Combination of Chloroiodomethane and<i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetramethylmethanediamine
a combination of chloroiodomethane (CH2ClI) and N,N,N′,N′-tetramethylmethanediamine (TMMD) in DMSO as the solvent at ambient temperature. The mechanism of the transformation is discussed on the basis of product analysis and 1H NMR spectral studies. The reagent system CH2ClI/TMMD also provides a convenient route to the Eschenmoser’s salt (Me2\overset+N=CH2,\overset−I).
THE MANNICH REACTION OF CARBONYL COMPOUNDS VIA SILYL ENOL ETHERS BY A COMBINATION OF CHLOROIODOMETHANE AND<i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-TETRAMETHYLDIAMINOMETHANE
The Mannich dimethylaminomethylation of carbonylcompounds is conveniently carried out via trimethylsilyl enol ethers by a combination of chloroiodomethane and N,N,N′,N′-tetramethyldiaminomethane in DMSO or DMF as the solvent at ambient temperature.