Triphenylphosphine → 3-{3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]benzyl}-5-trifluoromethyl-3H-benzothiazol-2-one

Participants

Reaction Steps

A suspension of 114 mg (0.52 mmol) of 5-trifluoromethyl-3H-benzothiazol-2-one, 150 mg (0.52 mmol) of {3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]phenyl}methanol and 261 mg (0.78 mmol) of polymer-bound triphenylphosphine (3mmol/g) is shaken at room temperature for 30 min. 178 mg (0.78 mmol) of di-tert-butyl azodicarboxylate are added to the suspension, and, after the mixture has been stirred at room temperature for 24 h, 50 mg (0.15 mmol) of polymer-bound triphenylphosphine (3 mmol/g) and 35 mg (0.15 mmol) of di-tert-butyl azodicarboxylate are again present and shaken at room temperature for 2 h. The reaction mixture is filtered, the filtrate is evaporated to dryness, and the residue is purified by means of preparative HPLC. The product is in the form of the trifluoroacetate; ESI: 489 (M+H); Rt.=2.81 min (method A);

Provenance & Evidence