How is (2R,3S,4R,5R)-5-amino-2,3,4-trihydroxy-6-oxohexyl hydrogen sulfate (CAS: 91674-26-9) typically synthesized?

(2R,3S,4R,5R)-5-amino-2,3,4-trihydroxy-6-oxohexyl hydrogen sulfate is typically synthesized through the condensation of an appropriate aldehyde with a chiral amino alcohol, followed by an acylation step. This process involves the use of a suitable catalyst, such as a Lewis acid, to promote the reaction, with a yield of approximately 85%. The selectivity for the desired stereochemistry is achieved through the use of chiral catalysts or chiral auxiliaries.