Isobutyl chloroformate → N-(2-Cyanobenzo[d]thiazol-6-yl)-3-methyl-3-(2,4,5-trimethyl-3,6-dioxocyclohexa-1,4-dien-1-yl)butanamide

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To the solution of 3-methyl-3-(2,4,5-trimethyl-3,6-dioxocyclohexa-1,4-dien-1-yl)butanoic acid (0.72 g, 3.09 mmol) and isobutyl chloroformate (0.44 g, 3.24 mmol) in 10 ml of dry THF, N-methyl morphorline (0.34 ml) was added at 0° C. The resultant mixture was stirred for 30 minutes at 0° C., and 6-amino-2-cyanobenzothiazole (0.36 g, 2.06 mmol) added. The resultant mixture was stirred overnight. The compound was directly purified with flash silica column using heptane and ethyl acetate as eluent to give a yield 10%. 1H NMR (300 MHz, CD2Cl2) δ 8.57 (d, J=2.0, 2H), 8.06 (d, J=9.0, 2H), 7.67 (s, 1H), 7.40 (dd, J=2.1, 8.9, 1H), 3.08 (s, 2H, CH2), 2.22 (s, 3H, CH3), 2.22 (s, 3H, CH3), 1.99 (s, 3H, CH3), 1.97 (s, 3H, CH3), 1.50 (s, 6H, CH3). MS (m/e): 408 (M+).

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