H. Hioki et al., INTRAMOLECULAR AMIDOALKYLATION OF CHIRAL IMINIUM IONS - STEREOSELECTIVE SYNTHESIS OF SYN-1,3-AMINOALCOHOLS, Tetrahedron letters, 34(38), 1993, pp. 6131-6134
The intramolecular Hosomi-Sakurai reaction of 3-siloxybutaniminium sal
ts exhibited a syn selectivity of up to 51:1, while the same type of r
eaction of 2-methyl-3-siloxypropaniminium salts showed up to 290:1 syn
selectivity.