Acetaldehyde → 1-(3-Pyridazinyl)-2-propanol

Temperatur

-70 °C

Diisopropylamine (8.52 ml) was dissolved in tetrahydrofuran (100 ml). To the solution was added dropwise, at 0° C., n-butyl lithium (a 1.64M hexane solution, 36.6 ml). The mixture was stirred for 30 minutes at the same temperature. The reaction mixture was cooled to −70° C., to which was added dropwise a solution of 3-methyl pyridazine (4.71 g) in tetrahydrofuran (10 ml). The mixture was stirred for 30 minutes at the same temperature, to which then added acetaldehyde (2.45 g). The mixture was wormed up to room temperature over 30 minutes, which was stirred for 6 hours at the same temperature. To the reaction mixture was added a saturated aqueous solution of ammonium chloride (10 ml). The mixture was concentrated under reduced pressure. The concentrate was purified by means of a silica gel chromatography (developing solvent: ethyl acetate-methanol 1:0→9:1) to afford the title compound (1.29 g).

1. additionTo the solution was added dropwise, at 0° C.
2. stirringThe mixture was stirred for 30 minutes at the same temperature, to which
3. waitThe mixture was wormed up to room temperature over 30 minutes
4. stirringwhich was stirred for 6 hours at the same temperature
5. concentrationThe mixture was concentrated under reduced pressure
6. customThe concentrate was purified by means of a silica gel chromatography (developing solvent: ethyl acetate-methanol 1:0→9:1)

ORD-Eintrag

ord-bc25f926050d4ac3b1dbfb41467c9799

Quelldatensatz

uspto-grants-2001_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06174877B1