Sodium hydride → Benzyl methyl 2-[3-[(4-methoxy)tetrahydropyran-4-yl]phenylmethyl]malonate

Temperatur

5 °C

A solution of benzyl methyl malonate (0.88 g, 4.22 mmol) in 3 mL of anhydrous DMA was added to a suspension of sodium hydride (0.11 g, 4.45 mmol) in 2 mL of anhydrous DMA at 5° C., and the reaction mixture was stirred for 40 min at 5° C. Then 3-[(4-methoxy)tetrahydropyran-4-yl]-α-bromotoluene [prepared as described in U.S. Pat. No. 5,424,320] (1.21 g, 4.24 mmol) was dissolved in 6 mL of anhydrous DMA and added to this solution. The reaction mixture was stirred for 2 h at 5° C., and for 18 h at room temperature. The reaction mixture was quenched with water (100 mL). The aqueous solution was extracted with ethyl acetate (3×70 mL) The combined organic extracts were washed with brine (1×100 mL), dried over magnesium sulfate, filtered and concentrated. The concentrated residue was purified by flash column chromatography on silica gel, eluting with 20% ethyl acetate in hexane, to give 0.93 g (53%) of benzyl methyl 2-[3-[(4-methoxy)tetrahydropyran-4-yl]phenylmethyl]malonate as a clear oil: HRMS: calcd for C24H28O6 413.1964, found 413.1952.

1. additionadded to this solution
2. stirringThe reaction mixture was stirred for 2 h at 5° C.
3. waitfor 18 h at room temperature
4. customThe reaction mixture was quenched with water (100 mL)
5. extractionThe aqueous solution was extracted with ethyl acetate (3×70 mL) The combined organic extracts
6. washwere washed with brine (1×100 mL)
7. dry with materialdried over magnesium sulfate
8. filtrationfiltered
9. concentrationconcentrated
10. customThe concentrated residue was purified by flash column chromatography on silica gel
11. washeluting with 20% ethyl acetate in hexane

ORD-Eintrag

ord-79a8b76442084c15aee1f0eed21aae2e

Quelldatensatz

uspto-grants-2006_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06998415B2