Diphenylmethylidenehydrazine → N-Benzhydrylidene-N'-(5-fluoro-3-methyl-pyridin-2-yl)-hydrazine

HRID 2285169Notes

Reaction equation

Br[C:2]1[C:7]([CH3:8])=[CH:6][C:5]([F:9])=[CH:4][N:3]=1.[C:10](=[N:23][NH2:24])([C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.CC(C)([O-])C.[K+]>C1(C)C=CC=CC=1.C1(B(O)O)C=CC=CC=1>[C:10](=[N:23][NH:24][C:2]1[C:7]([CH3:8])=[CH:6][C:5]([F:9])=[CH:4][N:3]=1)([C:17]1[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=1)[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of 2-bromo-5-fluoro-3-methyl-pyridine (190 mg, 1.0 mmol), benzhydrylidene-hydrazine (216 mg, 1.1 mmol), phenylboronic acid (5 mol %, 6 mg) and potassium tert-butoxide (157 mg, 1.4 mmol) in anhydrous toluene (6 mL) was degassed with a stream of argon, treated with Pd(OAc)2 (2 mol %, 5 mg) and racemic (1,1′-binaphthalene-2,2′-diyl)bis(diphenylphosphine) (2 mol %, 12 mg) and stirred at 80° C. for 1 h. After cooling to RT, the reaction mixture was diluted with EtOAc and washed with water followed by a saturated aqueous solution of NaHCO3. The organic layer was dried (MgSO4) and concentrated in vacuo. The resultant residue was purified by FCC on silica, using a gradient of 1-10% MeOH in DCM followed by 100% DCM, to afford the title compound (196 mg, 64%). LCMS (Method 4): Rt 3.44 min, m/z 306 [MH+].

Workup

customwas degassed with a stream of argon
additiontreated with Pd(OAc)2 (2 mol %, 5 mg) and racemic (1,1′-binaphthalene-2,2′-diyl)bis(diphenylphosphine) (2 mol %, 12 mg)
temperatureAfter cooling to RT
additionthe reaction mixture was diluted with EtOAc
washwashed with water
dry with materialThe organic layer was dried (MgSO4)
concentrationconcentrated in vacuo
customThe resultant residue was purified by FCC on silica

Sources & evidence

ORD record: ord-f149bc3a91dc489a947e7dcb29aad16e
Source dataset: uspto-grants-2015_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09145413B2

Reaction notes

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