Asymmetric Synthesis of Allyl- and α-Allenylamines from Chiral Imines and Alkynes via (η2-Imine)Ti(O-i-Pr)2 Complexes
摘要:
[GRAPHICS]The reaction of a divalent titanium reagent Ti(O-1-Pr)(4)/2i-PrMgX with optically active arylaidimines derived from arylaidehydes and O-methylphenylglycinol provided, in a highly diastereoselective manner, chiral (eta(2)-imine)Ti(O-i-Pr)(2) complexes, which in turn reacted with 1-alkynes or propargyl compounds to give optically active allyl- and alpha-allenylamines, respectively.