Reaktion #155467

Reaktionsgleichung

NaNO2

methyl 2-amino-5-ethyl-1,3-thiazole-4-carboxylate

NaOH

→

methyl 5-ethylthiazole-4-carboxylate

Lösungsmittel

NaHCO3

water

H3PO2

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturto warm up to room temperature where it
2. 2
   workup.STIRRINGstirred further for 2 h
3. 3
   SonstigeAfter recooling to 0° C.
4. 4
   Extraktionextracted twice with ether
5. 5
   Trocknendried over MgSO4
6. 6
   Einengenconcentrated

Vorschrift

The following diazotization step was adapted from Barton, A.; Breukelman, S. P.; Kaye, P. T.; Meakins, G. D.; Morgan, D. J. J. C. S. Perkin Trans I 1982, 159-164: A solution of NaNO2 (150 mg, 2.17 mmol) in water (1.0 mL) was added dropwise to a stirred, cold (0° C.) solution of methyl 2-amino-5-ethyl-1,3-thiazole-4-carboxylate (186 mg, 1.0 mmol) in 50% H3PO2 (3.2 mL). The mixture was stirred at 0° C. for 1 h and allowed to warm up to room temperature where it stirred further for 2 h. After recooling to 0° C., the mixture was treated slowly with a solution of NaOH (85 mg) in water (10 mL). The mixture was then diluted with saturated NaHCO3 solution and extracted twice with ether. The organic layers were combined, dried over MgSO4 and concentrated to give methyl 5-ethylthiazole-4-carboxylate (i.e. Cap-173, step a) (134 mg, 78%) as an orange oil (85% pure) which was used directly in the next reaction. Rt=1.58 min (Cond.-MD1); LC/MS: Anal. Calcd. for [M+H]+ C2H10NO2S: 172.05. found: 172.05.

Quelle