Scheme 242. [6]Heteracirculenoids Bearing Chalcogenole and Pyridine Rings.
Reagents and conditions: (a)449t-BuONO, DCM, rt, 4 h; (b) Zn, AcOH/EtOH, 0 °C, 10 min, then rt, 3 h; (c) TFA, 120 °C, 12 h.
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