Cl.[CH2:2]([O:4][C:5](=[O:8])[CH2:6][NH2:7])[CH3:3].C([O-])(=O)C.[Na+].CO[CH:16]1[CH:20]([C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[CH2:19][CH:18](OC)O1>O.C(O)(=O)C>[C:21]1([C:20]2[CH:19]=[CH:18][N:7]([CH2:6][C:5]([O:4][CH2:2][CH3:3])=[O:8])[CH:16]=2)[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1Glycine ethyl ester hydrochloride (0.44 g, 3.17 mmol), sodium acetate (0.47 g, 5.76 mmol) were dissolved in minimum amount of water (5 mL) and added to glacial acetic acid (5 mL). The mixture was heated to 80° C. and then added to a solution of 2,5-dimethoxy-3-phenyl-tetrahydrofuran (0.6 g, 2.88 mmol) in glacial acetic acid (5 mL). The reaction was stirred at 80° C. for 2 h and then diluted with water and extracted with ethyl acetate. The combined organic layers were washed with copious amount of water, dried over anhydrous sodium sulfate and concentrated in vacuo to afford ethyl 2-(3-phenylpyrrol-1-yl)acetate (0.55 g, 83%).
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