Methyl Isobutyl Ketone → HCID 136121425, compound

Participants

Reaction Steps

A mixture of ((S)-pyrrolidin-3-yl)methanamine (0.6 g, 6.0 mmol), Na2CO3 (2.2 g, 21 mmol) and methyl isobutyl ketone (12 mL, 6.0 mmol) under an N2 atmosphere was refluxed overnight using a Dean Stark apparatus. After allowing the reaction to cool to room temperature, 2-(4-chloro-7-methylquinazolin-2-yl)-3-fluorophenol (1.73 g, 5.99 mmol) was added, and the mixture was stirred overnight at room temperature under an N2 atmosphere. The reaction was then quenched with water. The aqueous layer was extracted twice with CH2Cl2. The organic extracts were combined, dried over Na2SO4, filtered, and concentrated to obtain a crude material containing 2-(4-((S)-3-((E)-(4-methylpentan-2-ylideneamino)methyl)pyrrolidin-1-yl)-7-methylquinazolin-2-yl)-3-fluorophenol which was then hydrolyzed by heating at 50° C. in 80 mL of a water/isopropanol mixture (1:1) for 6 hours. The reaction was cooled to room temperature, and the aqueous layer was extracted twice with CH2Cl2, dried over Na2SO4, filtered, and concentrated. Purification via silica gel chromatography using 5-20% MeOH and CH2Cl2 afforded 2-(4-((S)-3-(aminomethyl)pyrrolidin-1-yl)-7-methylquinazolin-2-yl)-3-fluorophenol (400 mg, 19% after 3 steps). LC/MS: m/z 353.1 (M+H)+ at 1.22 min (10%-99% CH3CN (0.035% TFA)/H2O (0.05% TFA)).

Provenance & Evidence