6-O-(2-hydroxybenzylideneamino)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranose 、
双丙酮半乳糖 以39%的产率得到(3aR,5R,5aS,8aS,8bR)-2,2,7,7-Tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-carbaldehyde O-((3aR,5R,5aS,8aS,8bR)-2,2,7,7-tetramethyl-tetrahydro-bis[1,3]dioxolo[4,5-b;4',5'-d]pyran-5-ylmethyl)-oxime