3-(p-Tolyl)acrylic acid → HCID 68773963, compound

Participants

Reaction Steps

Combine 4-methylcinnamic acid (0.093 g, 0.572 mmol), CH2Cl2 (5.0 mL), and DMF (3 drops) with stirring. Add oxalyl chloride (0.17 mL, 1.91 mmol) and stir the mixture for 2.5 h at room temperature. Concentrate the mixture in vacuo, add hexane (approximately 10 mL), re-concentrate in vacuo, and add CH2Cl2 (4.0 mL). Transfer the mixture to a 40 mL reaction vial and add a solution of 2-(3-dimethylamino-pyrrolidin-1-yl)-benzothiazol-6-ylamine (0.100 g, 0.381 mmol) (example 1, step 3) in CH2Cl2 (5.0 mL). Shake the reaction vial for 1 h at room temperature. Dilute the reaction mixture with CH2Cl2 (25 mL), wash with aqueous 1.0 M NaOH (50 mL), concentrate in vacuo, and purify using silica gel chromatography (12 g column, 10-20% MeOH/CH2Cl2 for 16 min.) to afford the title compound as a yellow solid (96 mg, 62%). mass spectrum (m/e): 407.3 [M+1], 405.2 [M−1]. 1H NMR (400 MHz, CDCl3): δ 8.33 (s, 1H), 7.71 (d, 1H, J=15.6 Hz), 7.67 (s, 1H), 7.50 (d, 1H, J=9.2 Hz), 7.39 (d, 2H, J=7.2 Hz), 7.13-7.19 (m, 3H), 6.51 (d, 1H, J=15.6 Hz), 3.82 (t, 1H, J=8.0 Hz), 3.71 (t, 1H, J=9.2 Hz), 3.53 (m, 1H), 3.39 (t, 1H, J=8.0 Hz), 2.89 (m, 1H), 2.36 (s, 3H), 2.30 (s, 6H), 2.25 (m, 1H), 1.99 (m, 1H).

Provenance & Evidence