Scheme 7. Synthesis of the marine alkaloid oriented β-carboline analogue compounds 147–162. Reagents and conditions: (a) SOCl2, MeOH; (b) 1-(1H-indol-3-yl) ethanone, I2, DMSO; (c) NaOH, MeOH, r.t.; (d) NH2(CH2)nR, HOBt, EDCI, Et3N, DMF, r.t.
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