Hydrochloric Acid → HCID 67041575、化合物

関与物質

反応手順

A solution of 3,5-dichloro-4-ethoxybenzoic acid (1) (285 mg, 1.21 mmol) and DIPEA (1.05 mL, 6.05 mmol) in DMF (2.5 mL) was added to HATU (690 mg, 1.82 mmol) and the orange mixture was stirred for 5 min prior to the addition of methyl 4-amino-2-methylbenzoate (2) (200 mg, 1.21 mmol) in DMF (1 mL). The resulting dark orange solution was stirred overnight for 18 h. 2 M HCl (10 mL) was added and stirring continued for 10 min, and then the mixture was extracted with diethyl ether. The organic layer was washed with water (3×15 mL), dried over MgSO4, filtered and the solvent was evaporated in vacuo. The yellow residue was purified by silica gel chromatography (40 g, 0-100% EtOAc in isohexane) to afford methyl 4-(3,5-dichloro-4-ethoxybenzamido)-2-methylbenzoate (3) (267 mg, 56%): m/z 380 (M−H)− (ES−). 1H NMR (400 MHz, CDCl3) δ: 7.97 (1H, s), 7.80 (3H, m), 7.54 (1H, dd), 7.51 (1H, d), 4.18 (2H, q), 3.89 (3H, s), 2.63 (3H, s), 1.49 (3H, t).

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