3-Cyano-5-hydroxymethyl-4-(4-phenoxy-phenylamino)-pyrrolo[1,2-b]pyridazine-6-carboxylic Acid Ethyl Ester → 3-Cyano-5-formyl-4-(4-phenoxy-phenylamino)-pyrrolo[1,2-b]pyridazine-6-carboxylic Acid Ethyl Ester

Participants

Reaction Conditions

Reaction Steps

To a solution of compound 16C (21.4 mg, 0.05 mmol) in chloroform (1 mL) was added MnO2 (<5 micron, activated, 17 mg, 0.20 mmol). The reaction was heated at 55° C. overnight, cooled to room temperature and purified by flash chromatography on a silica gel column (0-2% EtOAc/CH2Cl2) to give compound 18 as a yellow solid (20 mg, 94%). HPLC: 94% at 2.20 min (retention time) (PrimeSphere 5u C18-HC column, 4.6×30 mm eluting with 10-90% MeOH/H2O over 2 minutes containing 0.1% TFA; 5 mL/min, monitoring at 200 nm). MS (ES): m/z 427.0 [M+H]+.

Provenance & Evidence