N,N,N',N'-Tetramethylethylenediamine → 1',2'-Dihydrospiro[cyclopentane-1,3'-indole]-2'-one
Reaction equation
[NH:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH2:3][C:2]1=[O:10].[CH2:11]([Li])[CH2:12][CH2:13][CH3:14].CN(C)CCN(C)C.ICCCCI>C1COCC1.O>[NH:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[C:3]2([CH2:14][CH2:13][CH2:12][CH2:11]2)[C:2]1=[O:10]Participants
Procedure
To a −25° C. solution of oxindole (2.0 g, 15.0 mmol) in 40 (cm3) of anhydrous THF under N2 was added n-butyllithium (1.6 M in hexanes, 19.7 cm3, 31.5 mmol) drop-wise. To the resulting milky solution was added N,N,N′,N′-tetramethylethylenediamine (4.75 cm3, 31.5 mmol). After 30 min. a solution of 1,4-diiodobutane (21.9 g, 70.6 mmol) in THF (3 cm3) was added and the reaction mixture was allowed to warm to RT and stirred for 14 h. The reaction mixture was poured into water, extracted with EtOAc (×2), then the combined organic layers were washed with dil. HCl (pH 1), water (×2), dried (MgSO4) and evaporated. The residue was purified by column chromatography (SiO2, EtOAc:hexane 1:4) to afford the title compound (1.4 g, 7.5 mmol, 50%) as a tan solid: 1H NMR (CDCl3) δ 1.8-2.2 (m, 8H), 6.94 (dd, J=7.5, 1.0 Hz, 1H), 7.01 (dd, J=7.5, 1.0 Hz, 1H), 7.14-7.25 (m, 2H), 9.30 (br s, 1H).
Workup
- extractionextracted with EtOAc (×2)
- washthe combined organic layers were washed with dil. HCl (pH 1), water (×2)
- dry with materialdried (MgSO4)
- customevaporated
- customThe residue was purified by column chromatography (SiO2, EtOAc:hexane 1:4)
Sources & evidence
- ORD record
- ord-dd1d64c69de746a59ccd873b9c917144
- Source dataset
- uspto-grants-2003_04
- Patent number
- US06544970B2
Reaction notes
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