Scheme 1.
Synthetic route for the target compounds (4a–o) from dehydroabietic acid (DAA, 1). Reagents and conditions: (a) 1,4-dibromo-2,3-butanedione, HOAc, 120 °C, 2 h; (b) corresponding amine or heterocycle, K2CO3, KI, MeCN, 85 °C, 8–12 h.
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