Lithium Hexamethyldisilazide → 1-(Pyridazin-3-yl)ethan-1-ol

Temperature

-78 °C

To a solution of compound 2 (6.35 g, 21 mmol) in THF (20 mL) was added LiHMDS (1 M in THF, 22 mL, 22 mmol) via a syringe at −78° C. under a nitrogen atmosphere. After 1 h a solution of compound 2A (3.31 g, 20.66 mmol) in THF (32 mL) was added dropwise at −78° C. The mixture was stirred at −78° C. for 1.5 h then quenched by addition of a solution of sat. NH4Cl (50 mL), the resulting mixture was stirred overnight at room temperature, extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with brine (2×50 mL), dried over sodium sulfate, concentrated in vacuo and the residue was purified by column chromatography on silica gel (petroleum ether:THF=40:1) to give compound 3 (3.21 g, 42%) as a light yellow solid.

1. customthen quenched by addition of a solution of sat. NH4Cl (50 mL)
2. stirringthe resulting mixture was stirred overnight at room temperature
3. extractionextracted with ethyl acetate (3×100 mL)
4. washThe combined organic layers were washed with brine (2×50 mL)
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated in vacuo
7. customthe residue was purified by column chromatography on silica gel (petroleum ether:THF=40:1)

ORD record

ord-66132a60d5fa4648bd733e115d7ea14c

Source dataset

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09212153B2