follows a selective thiophilic course leading to stabilised dithioacetal oxide carbanions, which have been subsequently treated with electrophiles. The resulting dithioacetal oxides are readily transformed into aldehydes or spontaneously to ketones. The specificity of this “Umpolung” related chemistry is that it involves an addition reaction and not a deprotonation. Carbophilic addition has not been evidenced
Reaction of dithioester sulfines 4 with amines leads to thioamides 5. Sulfine 7, obtained from (-)-thiocamphor, reacts with primary amines at room temperature to afford chiral imines 8. Carbophilic addition, instead of thiophilic addition, has thus been evidenced.
METZNER, PATRICK;PHAM, THI NHAM, J. CHEM. SOC. CHEM. COMMUN.,(1988) N 5, 390-391