2-Amino-6-methoxybenzothiazole → 2-Amino-6-benzothiazolol

Participants

Reaction Conditions

Reaction Steps

To a vial equipped with a magnetic stir bar, was added 2-amino-6-methoxybenzthiazole (1.0 g, 5.55 mmol, 1.0 equiv). To the vial, was added 48% HBr in AcOH (1.5 mL) and 45% HBr aqueous solution (1.5 mL). The vial was sealed and heated to 135° C. for 3 h until LCMS indicated completion of the reaction. The mixture was allowed to rt. The solid precipitate was filtered, washed with water (2 mL), diethyl ether (2 mL×2) and dried in vacuo to afford an off white solid GC-4-49 (1.0 g, 73%). 1H-NMR (400 MHz, DMSO) δ: 9.42 (br, 2H), 7.31 (m, 2H), 6.87 (dd, J=8.8 Hz, 2.4 Hz, 1H); MS: 248.1 [M+H+—HBr].

Provenance & Evidence