3-Nitrobenzylamine → 5-Aminoindole

Participants

Reaction Steps

Compound 84 was prepared using methods shown in Example 1, wherein 2-fluoro-5-nitrobenzonitrile was reacted with 3-nitrobenzyl amine in Step A. Following steps B through E, the 3-nitrobenzyl intermediate was reduced using stannous chloride in ethanol to provide the corresponding 5-amino indole intermediate. Dimethylation of the 5-amino group was carried out using aqueous formaldehyde solution (37% w/w, 10 eq.) and MP-cyanoborohydride resion (2.42 mmol/g, 1.5 eq.) in methanol:acetic acid (9:1, v/v) at room temperature for about 15 hours.

Provenance & Evidence