Acetic Acid → 8-benzyl-3-(2,5-dimethyl-1H-pyrrol-1-yl)-6,7,8,9-tetrahydropyrazino[2,3-f][1,4]oxazepine

HRID 2188681Notes

Reaction equation

[CH2:1]([N:8]1[CH2:14][C:13]2[N:15]=[CH:16][C:17]([NH2:19])=[N:18][C:12]=2[O:11][CH2:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:20][C:21](=O)[CH2:22][CH2:23][C:24](=O)[CH3:25].C(O)(=O)C.C1(C)C=CC=CC=1>C(OCC)(=O)C>[CH2:1]([N:8]1[CH2:14][C:13]2[N:15]=[CH:16][C:17]([N:19]3[C:24]([CH3:25])=[CH:23][CH:22]=[C:21]3[CH3:20])=[N:18][C:12]=2[O:11][CH2:10][CH2:9]1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of 8-benzyl-6,7,8,9-tetrahydropyrazino[2,3-f][1,4]oxazepin-3-amine (100 mg), 2,5-hexanedione (50 μL), acetic acid (164 μL) and toluene (3 mL) was stirred at 80° C. for 24 hr. The mixture was diluted with ethyl acetate at room temperature, and the organic layer was washed with water and saturated brine, dried over magnesium sulfate, and concentrated. The residue was purified by silica gel column chromatography (solvent gradient: 10→100% ethyl acetate/hexane) to give the title compound (60 mg, 46%) as a pale-yellow oil.

Workup

washthe organic layer was washed with water and saturated brine
dry with materialdried over magnesium sulfate
concentrationconcentrated
customThe residue was purified by silica gel column chromatography (solvent gradient: 10→100% ethyl acetate/hexane)

Sources & evidence

ORD record: ord-1f41431a17b0499685cefb08f8fe5f95
Source dataset: uspto-grants-2012_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08324201B2

Reaction notes

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