Cesium carbonate → HCID 136413571, Verbindung
Reaktionsgleichung
[CH2:1]([O:3][C:4]([C:6]1[C:7]([OH:28])=[C:8]2[C:20]([C:21]3[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][CH:22]=3)=[N:19][S:18][C:9]2=[C:10]([C:12]#[C:13][Si](C)(C)C)[N:11]=1)=[O:5])[CH3:2].C([O-])([O-])=O.[Cs+].[Cs+]>CCO.C(Cl)Cl>[CH2:1]([O:3][C:4]([C:6]1[C:7]([OH:28])=[C:8]2[C:20]([C:21]3[CH:22]=[CH:23][C:24]([Cl:27])=[CH:25][CH:26]=3)=[N:19][S:18][C:9]2=[C:10]([C:12]#[CH:13])[N:11]=1)=[O:5])[CH3:2]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
To a solution of 3-(4-chloro-phenyl)-4-hydroxy-7-trimethylsilanylethynyl-isothiazolo[5,4-c]pyridine-5-carboxylic acid ethyl ester (0.189 mmol) in EtOH/CH2Cl2 (1/1, 0.76 mL) was added Cs2CO3 (0.227 mmol) with stirring at r.t. After 16 h the mixture was partitioned between 1N HCl (10 mL) and EtOAc (10 mL). The aqueous phase was extracted with EtOAc (2×10 mL). The combined organic layers were washed with brine and water, dried over MgSO4 and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel, eluting with 0-20% EtOAc/CH2Cl2, to give the title compound (38 mg) as a white solid: MS (m/z) 357.0 (M−1).