Scheme 2.
Synthetic route for compounds 7a–d. Reaction conditions: (a) K2CO3, acetone, MW, 110 °C, 60 min; (b) HNMe2, MeOH, 110 °C, 48 h; (c) CuSO4, sodium ascorbate, TBTA, RT, overnight; (d) AcCl, MeOH, 0 °C, 15 min.
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