Water → 1-Phenyl-1H-indazole

HRID 655018Notes

Reaction equation

[C:1]1([N:7]2[C:15]3[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=3)[C:9](N3CCNCC3)=[N:8]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C(=O)([O-])[O-].[K+].[K+].ClCP(=O)(C)C.O>CN(C)C=O>[C:1]1([N:7]2[C:15]3[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=3)[CH:9]=[N:8]2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1

Participants

Conditions

Temperature: 90 °C

Procedure

A stirred mixture of 4.3 g of 1-phenyl-3-(1-piperazinyl)-1H-indazole (prepared as in Example 2), 2.3 g of potassium carbonate, and 2.3 g of chloromethyldimethylphosphine oxide in 75 ml of dimethylformamide was heated at 90°, under nitrogen, for 16 hrs. Additional chloromethyldimethylphosphine oxide (0.6 g) was added, and the reaction mixture heated at 90° C. for 24 hrs. The reaction mixture was poured into water and the aqueous solution extracted with ethyl acetate. The extract was washed with brine, dried over anhydrous magnesium sulfate and concentrated to an oil. Flash chromatography of the oil on silica gel, eluting with dichloromethane/methanol (10%) followed by concentration of the appropriate fractions and trituration with diethyl ether gave 2.5 g (45%) of 3-[4-(dimethylphosphinylmethyl)-1-piperazinyl)]-1-phenyl-1H-indazole.

Workup

temperaturewas heated at 90°, under nitrogen, for 16 hrs
extractionthe aqueous solution extracted with ethyl acetate
washThe extract was washed with brine
dry with materialdried over anhydrous magnesium sulfate
concentrationconcentrated to an oil
washFlash chromatography of the oil on silica gel, eluting with dichloromethane/methanol (10%)

Sources & evidence

ORD record: ord-8b2a7635b0354f6d976a638e50d143ee
Source dataset: uspto-grants-1992_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05134236

Reaction notes

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