tested as chiral auxiliaries in the stereoselectivesynthesis of β-lactams by condensation of the titanium enolates of 2-pyridyl thioesters with chiral imines. The amines were selected among the following classes of compounds: benzylic amines, β-aminoalcohols, β-heterosubstituted α-aminoesters. Inexpensive and available in both enantiomeric forms α-methylbenzylamine was identified as the chiral auxiliary
Synthetic Versatility of<i>N</i>-(Silylmethyl)imines: Water-Induced Generation of<i>N</i>-Protonated Azomethine Ylides of Nonstabilized Type and Fluoride-Induced Generation of 2-Azaallyl Anions
N-(Silylmethyl)imines generateN-protonatedazomethineylides of nonstabilized type when treated with water in HMPA, which undergo stereospecific and regioselectivecycloadditions with electron-poo...