Scheme 5.
Bromide displacement from oxetane 9 c. a) NaN3, DMF, 60 °C; b) phenylacetylene, CuSO4⋅5 H2O (10 mol %), sodium ascorbate (30 mol %), H2O/CH2Cl2 (1:1), RT; c) imidazole, NaI, K2CO3, DMF, 80 °C.
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