Reactions of Iminium Ions Bearing P-Heteroatom Substituents

Reactions of Iminium Ions Bearing P-Heteroatom Substituents 

Microwave-assisted Petasis borono-Mannich reactions of arylboronic acids, secondary amines and salicylaldehyde have been carried out in CH2CI2 at 120 °C for 10 min [40], The main problem encountered here was incomplete conversions, resulting in modest adduct yields (23-76%). The reaction of a primary amine (p-ani-sidine) under the same conditions failed to produce the desired adducts, giving instead only the imines (cf. reactions with glyoxylic acid). 

---