Dimethyl Sulfoxide → N-1,2-benzisoxazol-3-yl-4-(4-phenyl-1,3-oxazol-2-yl)piperazine-1-carboxamide

HRID 2262902Notes

Reaction equation

[C:1]1([C:7]2[N:8]=[C:9]([N:12]3[CH2:17][CH2:16][NH:15][CH2:14][CH2:13]3)[O:10][CH:11]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[O:18]1[C:22]2[CH:23]=[CH:24][CH:25]=[CH:26][C:21]=2[C:20]([N:27](C(OCC(Cl)(Cl)Cl)=O)[C:28](OCC(Cl)(Cl)Cl)=[O:29])=[N:19]1.C(N(C(C)C)CC)(C)C.CS(C)=O>O>[O:18]1[C:22]2[CH:23]=[CH:24][CH:25]=[CH:26][C:21]=2[C:20]([NH:27][C:28]([N:15]2[CH2:16][CH2:17][N:12]([C:9]3[O:10][CH:11]=[C:7]([C:1]4[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=4)[N:8]=3)[CH2:13][CH2:14]2)=[O:29])=[N:19]1

Participants

Conditions

Temperature: 70 °C

Procedure

A mixture of 1-(4-Phenyl-1,3-oxazol-2-yl)piperazine (391 mg, 0.807 mmol), bis(2,2,2-trichloroethyl) 1,2-benzisoxazol-3-ylimidodicarbonate (370 mg, 1.61 mmol), diisopropylethylamine (0.141 ml, 0.807 mmol) and dimethylsulfoxide (5 ml) was stirred at 70° C. for 2 hours. The reaction mixture was poured to water and extracted with ethyl acetate. The extract was washed with water and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=2:1) to give the desired product as a solid. The resulting solid was recrystallized from a mixed solvent of ethyl acetate and hexane to give 44.0 mg (14.1%) of the desired product. mp 171-172° C.

Workup

extractionextracted with ethyl acetate
washThe extract was washed with water
dry with materialdried over anhydrous magnesium sulfate
distillationThe solvent was distilled off under reduced pressure
customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=2:1)

Sources & evidence

ORD record: ord-9ae19a1ebc874e4193a4b0ba44e69f4c
Source dataset: uspto-grants-2010_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07851473B2

Reaction notes

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