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Synthesis of cytisine derivatives. Reagents and conditions: (a) (Boc) 2O, Na2CO3, CH2Cl2, H2O, reflux, 2 h; (b) NBS, CH2Cl2, reflux, 2 h; (c) R-B(OH)2, Pd(PPh3)4, base, DME or DMF, H2O [Ar], MW (30 W), 80 aC, 30 to 60 min; (d) H2O, MW (150 W), 150 °C, 30 min.
