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. 2022 Jul 26;10:975267. doi: 10.3389/fchem.2022.975267

FIGURE 3.

FIGURE 3

Synthetic route of α-substituted indole-3-acetic acids. Reagents and conditions: a) DCC, DMAP, MeOH, dry CH2Cl2, r.t.; b) TEBAC, methyl chloroformate, DCM, 30% NaOH (aq.), ice bath; c) R-Br, LDA, HMPA, THF, −78°C–0°C; d) 30% NaOH (aq.): CH3OH = 1:2 (v/v), 70°C, 4 h, 2 M HCl.