Moving forward, a Cbz group was appended to the oxathiazinane nitrogen for a subsequent ring-opening with NaN3 (Scheme 4). The alkene of 10 was cleaved by dihydroxylation followed by treatment with NaIO4. Aldehyde 12 was unstable to purification and was immediately treated with TsOH to form hemiacetal 13 as a mixture of anomers. This anomeric mixture was bis-acetylated with Ac2O/pyridine, and the anomeric acetate was exchanged with thiophenol using BF3•OEt2.