Scheme 1.
Synthetic route to β-carboline alkaloids (A) 3–6 and (B) 8–10. Reagents and conditions: (i) MeOH, H2SO4, reflux; (ii) Aromatic aldehyde derivatives, TFA/CHCl3, MW, 100W, 30 min; (iii) DMF, KMnO4, 3 h, rt.
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