The next step is the ring opening of γ-lactones to generate the ketone functionality. This can be achieved by treating the γ-lactone with the carbene generated in the first step. The carbene inserts into the C-H bond of the γ-lactone, leading to the ring opening and formation of the ketone group.
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methyl 4,6-O-benzylidene-2-O-diazoacetyl-3-O-pivaloyl-α-D-mannopyranoside
