反应详情

To a solution of the product of step c above (500 mg, 1.44 mmol) and 5-amino-isophthalic acid dibenzyl ester (520 mg, 1.44 mmol) in DMF (3 ml) was added 1-hydroxybenzotriazole (HOBt) (195 mg, 1.44 mmol), 4-dimethylaminopyridine (DMAP) (cat.) and 1-(3-dimethylaminopropyl-3-ethylcarbodiimide hydrochloride (EDC) (280 mg, 1.44 mmol). The solution was kept at room temperature for 72 h, poured over 1M hydrochloric acid (20 ml) and the product was extracted with ethyl acetate (2×20 ml). The product crystallised from the ethyl acetate extracts. The crystals were collected by filtration, dried and triturated with methanol to afford a white solid (453 mg, 46%). 1H NMR (300 MHz, d6-DMSO) 13.00 (1H, br s), 10.50 (1H, s), 8.84 (2H, s), 8.61 (1H, s), 8.28 (2H, m), 8.00 (3H, m), 7.50 (12H, m), 5.41 (4H, s), 2.98 (2H, d), 2.00 (1H, m), 1.69-1.16 (12H, m).

1. extractionthe product was extracted with ethyl acetate (2×20 ml)
2. customThe product crystallised from the ethyl acetate
3. filtrationThe crystals were collected by filtration
4. customdried
5. customtriturated with methanol