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By the activation of general imines or using activated imines (N-tosylimines or Ndiphenyl-phosphinoylimines), we developed three types of stereoselective reactions with imines: aldol reaction, allylation, and aziridiantion, and optically active 2-imidazolines and aziridines were obtained. According to experimental evidences, Sakurai-Hosomi reactions in the presence of catalytic amount of TBAF was demonstrated to be a¯uoride-triggered autocatalytic mechanism. In addition, optically activedoi:10.1351/pac199971061033 fatcat:wxievrwhlrardmzijbgs7znlpy