Triethylamine → 2'-(acetylamino)-N-(2,2-dimethyl-4-oxo-4H-1,3-benzodioxin-7-yl)-4'-methyl-4,5'-bi-1,3-thiazole-2 carboxamide

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Reaction Steps

2′-Acetylamino-4′-methyl-[4,5′]bithiazolyl-2-carbonyl chloride, prepared as in Step I of Example 13, described above, (200 mg, 0.66 mmol, 1 eq.), is dissolved in THF (8 ml) and DCM (4 ml). 7-Amino-2,2-dimethyl-4H-1,3-benzodioxine-4-one, Amine 3 prepared as described above, (128.0 mg; 0.66 mmol; 1 eq.) and triethylamine (0.19 ml; 1.33 mmol; 2 eq.) are added and the mixture is stirred overnight at rt. Solvents are evaporated and the crude product is purified by crystallization in MeOH. The resulting product is washed with MeOH and NaHCO3 (sat), affording 2′-(acetylamino)-N-(2,2-dimethyl-4-oxo-4H-1,3-benzodioxin-7-yl)-4′-methyl-4,5′-bi-1,3-thiazole-2 carboxamide as a beige solid (200 mg; 65%). 1H NMR (DMSO-d6, 300 MHz) δ 1.67 (s, 6H), 2.13 (s, 3H), 2.49 (s, 3H), 7.28 (m, 1H), 7.56 (s, 1H), 7.64 (br d, J=9 Hz, 1H), 7.75 (s, 1H), 11.65 (br s, 1H). M− (ESI): 457.08; M+ (ESI): 459.13. HPLC (method A), Rt: 3.86 min (purity: 97.7%).

Provenance & Evidence