Triphenylphosphine → Methyl [3-[2-(1,6-dihydro-6-oxo-3,4-diphenyl-1-pyridazinyl)ethyl]phenoxyacetate]

HRID 981477Notes

Reaction equation

N(C(OCC)=O)=NC(OCC)=O.[C:13]1([C:19]2[C:24]([C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=3)=[N:23][NH:22][C:21](=[O:31])[CH:20]=2)[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1.O[CH2:33][CH2:34][C:35]1[CH:36]=[C:37]([CH:44]=[CH:45][CH:46]=1)[O:38][CH2:39][C:40]([O:42][CH3:43])=[O:41].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>C1COCC1>[O:31]=[C:21]1[N:22]([CH2:33][CH2:34][C:35]2[CH:36]=[C:37]([CH:44]=[CH:45][CH:46]=2)[O:38][CH2:39][C:40]([O:42][CH3:43])=[O:41])[N:23]=[C:24]([C:25]2[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=2)[C:19]([C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=2)=[CH:20]1

Participants

Conditions

Temperature: 0 °C

Procedure

Diethyl azodicarboxylate (2.73 g, 2.50 mL, 16 mmol) was added to a stirred solution of 5,6-diphenyl-3(2H)-pyridazinone (3.00 g, 12 mmol), methyl [3-(2-hydroxyethyl)-phenoxy]acetate (2.80 g, 13 mmol) and triphenylphosphine (4.12 g, 16 mmol) in dry THF (75 mL) maintained at 0° C. The ice bath was removed and the mixture stirred at room temperature for 1.75 hours before removal of the solvent. The residue was chromatographed twice on columns of silica gel using mixtures of diethyl ether and hexanes (7:3) and then (3:2) as eluent to give methyl [3-[2-(1,6-dihydro-6-oxo-3,4-diphenyl-1-pyridazinyl)ethyl]phenoxyacetate] (5.12 g, 98%), contaminated with 0.6 equivalents of 1,2-dicarbethoxy hydrazine, as a white foam.

Workup

customThe ice bath was removed
customThe residue was chromatographed twice on columns of silica gel using mixtures of diethyl ether and hexanes (7:3)

Sources & evidence

ORD record: ord-13373c8e04cb4fada8a204b37e54929c
Source dataset: uspto-grants-1991_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04992439

Reaction notes

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