We found that chiral allylic acetals gave the corresponding
aziridines in low yields and without stereoselectivity,
while diastereoselective cyclopropanation of the same
substrates has been reported
[Mash, E. A.; Nelson, K. A. Tetrahedron 1987,
43, 679; Mash, E. A.; Hemperly,
S. B.; Nelson, K. A.; Heidt, P. C.; Van Deusen, S.
J. Org. Chem. 1990, 55, 2045].