Hexamethylphosphoramide → HCID 79130368, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of cyclobutanecarbonitrile (405 mg, 5 mmol) in THF (7 mL) was added 2.0M lithium diisopropylamide (2.5 ml, 5 mmol) dropwise at −78° C. and the reaction solution was stirred at −78° C. for 40 minutes. A solution of dihydro-2H-pyran-4(3H)-one (550 mg, 5.5 mmol) in hexamethylphosphoramide (268 mg, 1.5 mmol) was added and the mixture was warmed up to room temperature, and stirred for 3 hours. The reaction mixture was quenched with 1N aqueous HCl solution and extracted with EtOAc (3×20 mL). The combined organic phases were washed with brine (10 mL), dried over Na2SO4, filtered, and concentrated. The residue was purified by column chromatography (eluted with petroleum ether: EtOAc=20:1) to obtain the title compound as a corloless oil (0.40 g, yield 44%). 1H NMR (400 MHz, CDCl3): δ 3.97 (dd, J=11.4, 4.2 Hz, 1H), 3.60-3.50 (m, 2H), 3.40-3.33 (m, 1H), 2.66-2.57 (m, 2H), 2.30-2.16 (m, 3H), 1.99-1.87 (m, 2H), 1.72 (dd, J=8.8, 3.6 Hz, 2H), 1.63-1.58 (m, 1H).

Provenance & Evidence