Sv. Ley et S. Mio, DISPIROKETALS IN SYNTHESIS .21. USE OF CHIRAL 2,2'-BIS(HALOMETHYL)DIHYDROPYRANS AS NEW PROTECTING AND RESOLVING AGENTS FOR 1,2-DIOLS, Synlett, (8), 1996, pp. 789
The enantioselective protection of 1,2-diols using chiral 2,2-bis(halo
methyl)dihydropyrans can be achieved in good yields. Deprotection of t
he resulting dispiroketal products was achieved by treatment with lith
ium 4,4'-di-tert-butylbiphenyl.