Реакция #65588

Уравнение реакции

2-cyclododecylethyl isocyanate

tetronic acid

triethylamine

KBr

→

4-Hydroxy-2-oxo-2.5-dihydro-furan-3-carboxylic acid-2-cyclododecyl-ethylamide

Растворители

chloroform

Условия реакции

Обработка

1. 1
   ДругоеThe reaction mixture was quenched with 1N HCl
2. 2
   Другоеthe layers separated
3. 3
   Сушкаthe organic fraction dried over MgSO4
4. 4
   Фильтрацияfiltered
5. 5
   Другоеchromatographed
6. 6
   Другоеto give a yellow solid

Методика

To a dry flask containing 40 mL of chloroform was added 1.87 g (18.7 mmol) of tetronic acid, 2.29 g (18.7 mmol) of 4-N,N-dimethylaminopyridine, 2.6 mL (18.7 mmol) of triethylamine followed by 4.4 g (18.7 mmol) of 2-cyclododecylethyl isocyanate. The reaction mixture was allowed to stir overnight at room temperature, after which time a small amount of starting materials was still evident by TLC. The reaction mixture was quenched with 1N HCl, the layers separated, the organic fraction dried over MgSO4, filtered, and stripped of solvent. The residue was flash chromatographed using acidic silica gel eluting with 25% EtOAc/hexane to give a yellow solid. M.P. 135°-137° C. Spectral data follow: 1H NMR (DMSO-d6) δ 8.05 (bs, 1H), 4.6 (s, 2H), 4.2 (bs, 10H), 3.25 (t, 2H), 2.5 (s, 3H), 1.2-1.4 (bm, >20H); IR (KBr) 3340, 2920, 2850 (C--H), 1750, 1650 cm-1 (C=0);

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