Asymmetric spirocyclization based on intramolecular conjugate addition usin
g a combination of a Lewis acid and an optically active cyclohexane-1,2-dio
l has been studied in connection with 1) the effect of substituents on the
cylclohexane-1,2-diol and 2) the effect of substituents on the substrate. T
his reaction was found to be both thermodynamically and kinetically control
led under restricted conditions.