Hydrolysis of oxazolines^a.

^aConditions A: 6 M HCl(aq), reflux; conditions B: conc. H₂SO₄, dioxane, 110 °C.

^bStarting from a mixture of diastereomers.

^cUsing pure diastereomer of 8.

^dHydrolysis reported in ref. 18.

^eReacted for 12 hours.

^fReacted for 24 hours.