تفاعل #2317987
ord-5122c6a9535b45f09804b58dd454ccf1
معادلة التفاعل
المتفاعلات
الكواشف
المذيبات
ظروف التفاعل
المعالجة
- 1درجة الحرارةat reflux for forty eight hours
- 2أخرىThe solvent was evaporated
- 3غسيلwas washed with water
- 4تجفيفbrine and dried (MgSO4)
- 5أخرىevaporated
- 6أخرىThe product was purified on a 600 mL
- 7أخرىsilica dry column
- 8غسيلby elution with dichloromethane:acetic acid (99:1)
- 9أخرىThe appropriate fractions were evaporated
- 10غسيلThe residue was washed with ether
- 11أخرىdried
الإجراء التجريبي
A mixture of β-alanine amide hydrochloride (3.11 g, 25 mmol), 5-(phenylethynyl)thiophene-2-carboxaldehyde (5.31 g, 25 mmol), mercaptosuccinic acid (11.26 g, 75 mmol) and diisopropylethylamine (3.6 g, 27.5 mmol) was stirred in acetonitrile (300 mL) at reflux for forty eight hours. The solvent was evaporated and the residue was shaken with 2 N HCl (500 mL) and ethyl acetate (3×200 mL) The ethyl acetate solution was washed with water then brine and dried (MgSO4) and evaporated. The product was purified on a 600 mL. silica dry column by elution with dichloromethane:acetic acid (99:1) followed by dichloromethane:methanol:acetic acid (95:5:1). The appropriate fractions were evaporated. The residue was washed with ether and dried to provide the title compound as a white solid: (2.44 g, 23.5%): m.p. 175-178. 1H-NMR (DMSO-d6) δ 12.6 (broad, 1H), 7.56-7.57 (d, 1H, J=2.4 Hz), 7.54-7.55 (d, 1H, J=3.6 Hz), 7.4-7.46 (m, 4H), 7.28-7.32 (m, 2H), 6.90(s, 1H), 6.15 (s, 0.5 H), 6.12-6.13 (d, 0.5H, J=1.6 Hz), 4.24-4.28 (m, 1H), 4.15-4.19 (dd, 0.5H, J=3.6 Hz), 2.97-3.09 (m, 1H), 2.64-2.74 (m, 1H), 2.36-2.46 (m, 1H), 2.08-2.21 (m, 1H); MS(ESI) 413[M-H], 415[M+H]. Analytical HPLC; Capcell Pak C18, 30% acetonitrile: 70% 0.1% aqueous TFA.51 trans: 49 cis. FTIR (ATR) 1650, 1720 cm−1. Anal. (C20H18N2O4S2) calc. C, 57.95; H, 4.38; N, 6.76. obs. C, 57.59; H, 4.34; N, 6.56.