Scheme 4.
Reagents and conditions: (i) SOCl2, dry DMF/CH2Cl2, N2, rt, 6 h; (ii) indole, Et2AlCl, dry CH2Cl2, N2, −15 °C then rt, 4 h; (iii) LiAlH4, dry THF, N2, reflux, 1 h.
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