Methanol → Tert-butyl 2-(1-methylpiperidin-4-yl)hydrazinecarboxylate

Temperatur

25 °C

To a solution of tert-butyl 2-(1-methylpiperidin-4-ylidene)hydrazinecarboxylate (500 mg, 2.20 mmol) in THF (50 mL) was added DIBAl-H (22 mL, 22 mmol) under nitrogen atmosphere. The resulting mixture was stirred at 25° C. overnight. Methanol (5 mL) was added to quench the reaction at −78° C. After being stirred at room temperature for 1 h, water (10 mL) was added. The solid was filtered off and washed with EtOAc. The combined filtrate was partitioned and extracted with EtOAc (3×50 mL), dried over Na2SO4, and concentrated. The residue was purified by silica gel chromatography eluting with EtOAc/petroleum ether (1:10) to give tert-butyl 2-(1-methylpiperidin-4-yl)hydrazinecarboxylate (350 mg, 69% yield) as a colorless oil. LCMS (ESI) m/z: 230.4 [M+H+].

1. customto quench
2. customthe reaction at −78° C
3. stirringAfter being stirred at room temperature for 1 h
4. filtrationThe solid was filtered off
5. washwashed with EtOAc
6. customThe combined filtrate was partitioned
7. extractionextracted with EtOAc (3×50 mL)
8. dry with materialdried over Na2SO4
9. concentrationconcentrated
10. customThe residue was purified by silica gel chromatography
11. washeluting with EtOAc/petroleum ether (1:10)

ORD-Eintrag

ord-85c9a7c1b86540e0a58e0307bac4a0ed

Quelldatensatz

uspto-grants-2015_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09090628B2