Hydrazine hydrate (1:1) → 3-Methoxy-4-(2-methyloxazol-5-yl)benzohydrazide

HRID 1398119Notes

Reaction equation

[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][C:11]=1[C:12]1[O:16][C:15]([CH3:17])=[N:14][CH:13]=1)[C:6](O)=[O:7].O.[NH2:19][NH2:20]>C1COCC1>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:9]=[CH:10][C:11]=1[C:12]1[O:16][C:15]([CH3:17])=[N:14][CH:13]=1)[C:6]([NH:19][NH2:20])=[O:7]

Participants

Conditions

Temperature: -10 °C

Procedure

N,N′-Carbonyldiimidazole (115 g) was added to a suspension of 3-methoxy-4-(2-methyl-1,3-oxazol-5-yl)benzoic acid (83.0 g) in THF (1 L) at room temperature, and the mixture was stirred for 1 hr. The reaction mixture was cooled to −10° C., hydrazine monohydrate (173 mL) was added, and the mixture was stirred at room temperature for 16 hr. The solvent in the reaction mixture was evaporated under reduced pressure, and water was added to the residue. The resultant solid was collected by filtration, washed with water, dried under reduced pressure, and washed with IPE to give the title compound (85.8 g). 1H NMR (300 MHz, DMSO-d6) δ 2.48 (3H, s), 3.97 (3H, s), 4.53 (2H, brs), 7.44-7.58 (3H, m), 7.68 (1H, d, J=8.0 Hz), 9.85 (1H, s).

Workup

stirringthe mixture was stirred at room temperature for 16 hr
customThe solvent in the reaction mixture was evaporated under reduced pressure, and water
additionwas added to the residue
filtrationThe resultant solid was collected by filtration
washwashed with water
customdried under reduced pressure
washwashed with IPE

Sources & evidence

ORD record: ord-1bf489e4695647f4ac9b6ec6aaa49875
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08901309B2

Reaction notes

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