反应 #1509619

反应方程式

6-bromo-5-oxo-hexanoic acid methyl ester

Boc-guanidine

NaI

→

18

收率 65.0%

2-amino-4-(3-methoxycarbonyl-propyl)-imidazole-1-carboxylic acid tert-butyl ester

收率 65.0%

溶剂

DMF

—

hexanes

反应条件

后处理

1. 1
   其他After 24 h the DMF was removed under reduced pressure
2. 2
   洗涤washed with water (3×50 mL) and brine (50 mL)
3. 3
   干燥before being dried (Na2SO4)
4. 4
   过滤filtered
5. 5
   其他evaporated to dryness
6. 6
   其他The resulting oil was purified by flash column chromatography (50-100% EtOAc/Hexanes)
7. 7
   其他to obtain a yellow oil
8. 8
   过滤upon filtration

实验过程

6-bromo-5-oxo-hexanoic acid methyl ester (2.30 g, 10.3 mmol), Boc-guanidine (4.92 g, 30.9 mmol),32 and NaI (3.07 g, 20.6 mmol) were dissolved in DMF (30 mL) and allowed to stir at room temperature. After 24 h the DMF was removed under reduced pressure and the residue was taken up in ethyl acetate (100 mL) and washed with water (3×50 mL) and brine (50 mL) before being dried (Na2SO4), filtered and evaporated to dryness. The resulting oil was purified by flash column chromatography (50-100% EtOAc/Hexanes) to obtain a yellow oil. Trituration of the viscous oil with cold hexanes (20 mL) produced a precipitate, which upon filtration yielded 18 (1.89 g, 65%) as a pale yellow solid. 1H NMR (400 MHz, CDCl3) δ 6.53 (s, 1H), 5.6 (br s, 2H), 2.41 (t, 2H, J=7.2 Hz), 2.37 (t, 2H, J=7.2 Hz), 1.93 (quint., 2H, J=7.2 Hz), 1.58 (s, 9H); 13C NMR (75 MHz, CDCl3) δ 174.09, 150.11, 149.61, 138.39, 107.15, 84.81, 51.56, 33.65, 28.18, 27.68, 23.82; HRMS (ESI) calcd for C13H22N3O4 (MH)+ 284.1604, found 284.1606.

来源