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Solvolytic epoxide opening cascade for the synthesis of a brominated pyrana
aReagents and conditions: (i) K2CO3 (1.5 equiv), 1,1,1,3,3,3-hexafluoroisopropanol (0.05 M), rt; (ii) HCl (concentrated aq., 5 equiv), wet Et2O, rt, 34% over two steps.
