Diisopropylamine → HCID 23439987, Verbindung

Temperatur

-40 °C

To a solution of 2-methoxy-5-(methoxymethoxy)benzene (20 g, 0.1 2 mol) in THF is added diisopropylamine (0.24 g, 2.4 mmol). The solution is cooled to −40° C. followed by addition of MeLi (3M/THF, 72 mL, 0.216 mol) slowly. The resulting mixture is warmed to 0° C., stirred at 0° C. for 3 h, cooled back down to −40° C. and added N-formylpiperidine (24 mL, 0.216 mol). After stirring at −40° C. for 2 h, the mixture is quenched with a mixed solution of HCl (37%, 120 mL) and THF (250 mL). The temperature is then raised to rt and diluted with water (200 mL) and EtOAc (200 mL). The pH of the mixture is adjusted to 8-9 with solid K2CO3 and extracted with EtOAc (300 mL) twice. The organic layer is combined, dried over Na2SO4, and concentrated. The residue is purified on silica gel with 25% EtOAc/hexanes as eluent to give 2-methoxy-5-(methoxymethoxy)benzaldehyde.

1. temperatureThe resulting mixture is warmed to 0° C.
2. temperaturecooled back down to −40° C.
3. stirringAfter stirring at −40° C. for 2 h
4. customthe mixture is quenched with a mixed solution of HCl (37%, 120 mL) and THF (250 mL)
5. temperatureThe temperature is then raised to rt
6. additiondiluted with water (200 mL) and EtOAc (200 mL)
7. extractionextracted with EtOAc (300 mL) twice
8. dry with materialdried over Na2SO4
9. concentrationconcentrated
10. customThe residue is purified on silica gel with 25% EtOAc/hexanes as eluent

ORD-Eintrag

ord-aa0de4f973ad4523b1a7031c2e6c4512

Quelldatensatz

uspto-grants-2015_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09018210B2