Diisopropylamine → tetrahydro-3-(methoxymethyl)-4H-Pyran-4-one

Temperature

-78 °C

To a solution of diisopropylamine (6.1 g, 60 mmol) in THF (100 mL) cooled in an ice bath was added a 1.6 M solution of n-butyllithium in hexanes (37 mL, 60 mmol). The resulting solution was cooled to −78° C. To it was added tetrahydro-4H-pyran-4-one (5 g, 50 mmol) followed by phosphorous hexamethyltriamide (10 mL, 55 mmol). After 10 min, a solution of bromomethyl methyl ether (25 g, 200 mmol) in THF (50 mL) was added. Stirring was continued at 0° C. for 1 h and at room temperature overnight. The reaction was quenched by addition of a saturated solution of ammonium chloride in water. The resulting solution was extracted with ether three times. The combined extracts were dried over MgSO4 and concentrated. Flash chromatography on silica gel eluting with 20% ether/petroleum ether afforded the desired product (0.9 g oil). 1H NMR (CDCl3) δ 4.2 (2H, m), 4.1 (3H, s), 3.6-3.4 (4H, m), 2.4-2.3 (3H, m).

1. waitwas continued at 0° C. for 1 h and at room temperature overnight
2. customThe reaction was quenched by addition of a saturated solution of ammonium chloride in water
3. extractionThe resulting solution was extracted with ether three times
4. dry with materialThe combined extracts were dried over MgSO4
5. concentrationconcentrated

ORD record

ord-e79128a59e414220b84c1934285380d2

Source dataset

uspto-grants-2008_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07449467B2