反应 #163948

反应方程式

Glutaric anhydride

2-Amino-5-nitrothiazole

→

5-(5-nitrothiazol-2-ylamino)-5-oxopentanoic acid

收率 54.0%

溶剂

EtOAc

CH2Cl2

反应条件

后处理

1. 1
   其他was held at ambient temperature
2. 2
   萃取extracted with 1M NaOH (3×30 mL)
3. 3
   洗涤The combined aqueous layers were washed with EtOAc (20 mL)
4. 4
   萃取subsequently extracted with EtOAc (5×20 mL)
5. 5
   洗涤The combined organics were washed with brine (2×20 mL)
6. 6
   干燥dried (MgSO4)
7. 7
   过滤filtered
8. 8
   浓缩concentrated to dryness

实验过程

Glutaric anhydride (1.0 g, 8.8 mmol), TEA (1.35 ml, 9.6 mmol) and cat. DMAP were dissolved in CH2Cl2 (7 mL). 2-Amino-5-nitrothiazole (1.4 g, 9.64 mmol) was then added and the solution was held at ambient temperature. After 18 hours, the solution was diluted with EtOAc (50 mL) and extracted with 1M NaOH (3×30 mL). The combined aqueous layers were washed with EtOAc (20 mL) then acidified with 12M HCl and subsequently extracted with EtOAc (5×20 mL). The combined organics were washed with brine (2×20 mL), dried (MgSO4), filtered and concentrated to dryness to yield 5-(5-nitrothiazol-2-ylamino)-5-oxopentanoic acid (1.13 g, 54%) as an orange solid. 1H NMR (300 MHz, DMSO-d6) δ 12.59 (bs, 1H), 8.59 (s, 1H), 2.57 (t, J=7.4 Hz, 2H), 2.28 (t, J=7.3 Hz, 2H), 1.82 (quint., J=7.3 Hz, 2H); 13C NMR (75 MHz, DMSO-d6) δ 174.0, 172.8, 161.8, 142.8, 141.7, 34.1, 32.7, 19.6; HRMS (ESI) calcd for [C8H9N3O5S+H]+ 260.0336. found 260.0344. Method B with 5-(5-nitrothiazol-2-ylamino)-5-oxopentanoic acid (30 mg, 0.12 mmol) afforded the title compound VPC161276 (23 mg, 46%) as an orange solid. 1H NMR (300 MHz, DMSO-d6) δ 8.61 (s, 2H), 2.61 (t, J=7.2 Hz, 4H), 1.97 (quint., J=7.0 Hz, 2H); 13C NMR (75 MHz, DMSO-d6) δ 172.8, 162.0, 142.8, 141.5, 34.0, 19.3; HRMS (ESI) calcd for [C11H10N6O6S2+H]+ 387.0176. found 387.0185.

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