[Cl:1][C:2]1[C:7]([C:8]([NH:10][CH2:11][C:12]([O:14][CH3:15])=[O:13])=O)=[CH:6][N:5]=[C:4]2[NH:16][CH:17]=[CH:18][C:3]=12.O=P12OP3(OP(OP(O3)(O1)=O)(=O)O2)=O.C(=O)([O-])O.[Na+]>C(Cl)(Cl)Cl>[Cl:1][C:2]1[C:7]([C:8]2[O:13][C:12]([O:14][CH3:15])=[CH:11][N:10]=2)=[CH:6][N:5]=[C:4]2[NH:16][CH:17]=[CH:18][C:3]=12To a solution of methyl N-[(4-chloro-1H-pyrrolo[2,3-b]pyridin-5-yl)carbonyl]glycinate (167 mg) in chloroform (5 ml) was added diphosphorus pentoxide (886 mg) under ambient temperature, and the mixture was refluxed for 18 hours. The reaction solution was cooled and added to saturated aqueous sodium hydrogencarbonate. The reaction solution was extracted with ethyl acetate. The organic layer was washed with water. The organic layer was dried over magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by thin-layer silica gel column chromatography (chloroform:methanol=15:1) to obtain 4-chloro-5-(5-methoxy-1,3-oxazol-2-yl)-1H-pyrrolo[2,3-b]pyridine (45 mg) as a yellowish white solid.
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