4-Hydroxybenzaldehyde → HCID 20086821, Verbindung

39.3 g (150 mmol) of triphenylphosphine are added to a solution of 13.2 g (100 mmol) of 1,2-O-isopropylideneglycerol in 250 ml of dry THF, and the mixture is stirred at RT for 30 min. The mixture is cooled to about 0° C., and 12.2 g (100 mmol) of 4-hydroxybenzaldehyde and 31.9 g (150 mmol) of diisopropyl azodicarboxylate (DIAD) are added. The yellow reaction solution is stirred at RT for 16 h. The mixture is then concentrated using a rotary evaporator, and the residue is added to 150 ml of sat. sodium bicarbonate solution. The mixture is extracted with ethyl acetate (three times, 150 ml each), and the combined organic phases are dried over sodium sulphate. After removal of the solvent on a rotary evaporator, the crude product is purified chromatographically on silica gel 60 (mobile phase gradient cyclohexane→cyclohexane/ethyl acetate 2:1).

1. temperatureThe mixture is cooled to about 0° C.
2. stirringThe yellow reaction solution is stirred at RT for 16 h
3. concentrationThe mixture is then concentrated
4. customa rotary evaporator
5. additionthe residue is added to 150 ml of sat. sodium bicarbonate solution
6. extractionThe mixture is extracted with ethyl acetate (three times, 150 ml each)
7. dry with materialthe combined organic phases are dried over sodium sulphate
8. customAfter removal of the solvent
9. customon a rotary evaporator
10. customthe crude product is purified chromatographically on silica gel 60 (mobile phase gradient cyclohexane→cyclohexane/ethyl acetate 2:1)

ORD-Eintrag

ord-380eaec4e50147578c181d3ea38cefa5

Quelldatensatz

uspto-grants-2014_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08691850B2