Methyl p-toluenesulfonate → 3-(3'-benzyl-3,5-dimethyl-4'-oxo-4-phenyl-3',4'-dihydro-3H-[2,5']-bithiazolyliden-2'-ylideneamino)-4-(ethylamino)benzonitrile

Participants

Reaction Conditions

Reaction Steps

To an 8 mL vial was added 3,5-dimethyl-4-phenyl-3H-thiazole-2-thione (100 mg, 0.45 mmol), methyl p-toluenesulfonate (126 mg, 0.68 mmol) and anhydrous anisole (0.5 mL). The reaction was heated to 120° C. and stirred for 3 h. The cooled reaction mixture was diluted with anhydrous MeCN (3 mL) and then treated with 3-(3-benzyl-4-oxothiazolidin-2-ylideneamino)-4-(ethylamino)benzonitrile (50 mg, 0.14 mmol) and TEA (70 μL, 0.50 mmol). The reaction mixture was warmed to 80° C. and the resulting solution was allowed to stir for 16 h. The product mixture was concentrated under reduced pressure and chromatographed (silica gel, 1:1 EtOAc/Hex) to yield the title product (48.3 mg, 64%) as a yellow solid. 1H-NMR (CDCl3): δ 7.40 (5H, m), 7.33 (2H, m), 7.25 (3H, m), 7.23 (2H, m), 6.46 (1H, d), 5.18 (2H, s), 4.28 (1H, m), 3.46 (3H, s), 2.99 (2H, m), 2.28 (3H, s), 1.01 (3H, t); MS(ESI): 538 (MH+).

Provenance & Evidence