ASYMMETRIC INDUCTION IN THE SIGMATROPIC REARRANGEMENT VIA CHIRAL AMMONIUM YLIDES
The asymmetric sigmatropic rearrangements of the chiral ammonium chlorides (E)-(3a,b) were achieved upon treatment with t-BuOK followed by acidic hydrolysis of the aminonitriles (5a,b) obtained to give (R)-(+)-2-methyl-2-phenyl-3-butenal (6).The rea