The next step is the formation of the oxazoline ring. This is usually achieved by reacting the protected 2-amino-2-deoxy-D-glucose with a suitable oxazoline-forming reagent, such as chloroformates. This reaction leads to the formation of the oxazoline ring while leaving the amine group protected.
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(3aR)-7t-acetoxy-6c-acetoxymethyl-4c-methoxy-2-phenyl-(3ar,7ac)-3a,6,7,7a-tetrahydro-4H-pyrano[3,4-d]oxazole
(3aR)-6c-hydroxymethyl-4c-methoxy-2-phenyl-(3ar,7ac)-3a,6,7,7a-tetrahydro-4H-pyrano[3,4-d]oxazol-7t-ol
(3aR)-7t-acetoxy-6c-acetoxymethyl-4c-methoxy-2-phenyl-(3ar,7ac)-3a,6,7,7a-tetrahydro-4H-pyrano[3,4-d]oxazole
(3aR)-6c-hydroxymethyl-4c-methoxy-2-phenyl-(3ar,7ac)-3a,6,7,7a-tetrahydro-4H-pyrano[3,4-d]oxazol-7t-ol
