I[C:2]1[CH:3]=[C:4]([CH:10]=[CH:11][CH:12]=1)[C:5]([O:7][CH2:8][CH3:9])=[O:6].C([Sn](CCCC)(CCCC)[C:18]1[S:22][CH:21]=[N:20][CH:19]=1)CCC.O.CCOC(C)=O>C1COCC1.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[S:22]1[C:18]([C:2]2[CH:3]=[C:4]([CH:10]=[CH:11][CH:12]=2)[C:5]([O:7][CH2:8][CH3:9])=[O:6])=[CH:19][N:20]=[CH:21]1A mixture of commercially available ethyl 3-iodobenzoate (1.000 g; 3.62 mmol), 5-(tributylstannyl)thiazole (1.355 g; 3.62 mmol), and PdCl2(PPh3)2 (254 mg; 0.36 mmol) in anh. THF (20 ml) was heated to 75° C., under nitrogen, for 18 h. After cooling to rt, water and AcOEt were added. The separated aq. layer was further extracted with AcOEt. The mixed organic layers were washed with brine, dried over anh. MgSO4, filtered, and concentrated to dryness under reduced pressure. Purification by FC (heptane/AcOEt=1/1) afforded ethyl 3-(thiazol-5-yl)benzoate as a pale yellow solid. LC-MS (conditions A): tR=0.75 min.; [M+H]+: 233.94 g/mol.
Loading…
