Ethyl Acetate → HCID 86670539, compound

Participants

Reaction Steps

To a stirred solution of 1,1-dimethyl-3-butynoic acid (333 mg, 3.0 mmol), azetidine (250 mg, 4.5 mmol) and i-Pr2NEt (1.6 mL, 8.9 mmol) in CH2Cl2 (20 mL) was added solid HATU (1.25 g, 3.3 mmol). The mixture was stirred at rt for 20 h and concentrated to leave a yellow oil. This oil was taken up in EtOAc (100 mL), washed with 5% aq HCl (2×15 mL), satd aq NaHCO3 (15 mL) and brine (15 mL), and dried over Na2SO4. Removal of the solvent left an oil (819 mg) which was purified by chromatography on a 12-g silica cartridge, eluted with a 0-100% EtOAc in hexanes gradient, to afford 1-(azetidin-1-yl)-2,2-dimethylbut-3-yn-1-one (198 mg, 44%) as an oil. 1H NMR (CDCl3) 1.40 (s, 6H), 2.23 (m, 2H), 2.34 (s, 1H), 4.05 (m, 2H), 4.52 (m, 2H).

Provenance & Evidence