Dimethylformamide dimethyl acetal → 2-(3-(3-Chlorophenyl)-1-(dimethylamino)-3-oxoprop-1-en-2-yl)isoindoline-1,3-dione

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Reaction Conditions

Reaction Steps

A stirred mixture of 2-(2-(3-chlorophenyl)-2-oxoethyl)isoindoline-1,3-dione (782.2 mg, 2.610 mmol, 1 equiv) and 1,1-dimethoxy-N,N-dimethylmethanamine (1.5 mL, 11 mmol, 4.3 equiv) was heated at 100° C. for 18 hours. Excess 1,1-dimethoxy-N,N-dimethylmethanamine was removed by rotary evaporation. The crude product was purified by flash column chromatography on silica gel (50 to 100% ethyl acetate in heptane) to yield 740 mg (80%) of 2-(3-(3-chlorophenyl)-1-(dimethylamino)-3-oxoprop-1-en-2-yl)isoindoline-1,3-dione. LCMS (ESI) m+H=355.2; 1H NMR (400 MHz, CDCl3) δ: 7.90 (d of d, 2H), 7.77 (d of d, 2H), 7.57 (s, 1H), 7.44 (d, 1H), 7.37 (overlapping d and s, 2H), 7.31 (t, 1H), 3.00 (s, 6H).

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