Iodoethane → 3-Ethylindol-2-one

HRID 6985

반응식

HRID 6985 반응식
[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]CC.CN(C)CCN(C)C.ICC.[NH4+].[Cl-]>C1COCC1>[CH2:11]([C:3]1[C:2](=[O:10])[N:1]=[C:9]2[C:4]=1[CH:5]=[CH:6][CH:7]=[CH:8]2)[CH3:12]

참가 물질

7

반응물 5

HCID 6340IodoethaneHCID 8037N,N,N',N'-TetramethylethylenediamineHCID 25517Ammonium ChlorideHCID 321710OxindoleHCID 178418339Butyllithium

생성물 1

HCID 219862793-Ethylindol-2-one수율 2.9%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

실험 절차

A solution of oxindole (40 g, 0.3 mol) in dry THF (400 ml) under N2 was cooled to −25° C. and treated drop wise with n-butyl lithium (2.5M in hexanes, 240 ml, 0.6 mol). To the resulting solution was added N,N,N′,N′-tetramethylethylenediamine (90.4 ml, 0.6 mol). After 30 min. iodoethane (48 ml, 0.6 mol) was added and the reaction mixture was allowed to warm to RT and stirred over night. The reaction mixture was poured into aqueous NH4Cl solution, extracted with EtOAc (2×) and the combined organic layers were washed with dil. HCl, water, brine, dried (MgSO4) and concentrated. The residual oil was triturated with hexane to afford the crude product (24.5 g, 51%). A sample (3 g) was recrystallized from EtOAc/hexane to obtain the title compound (1.4 g), m.p. 100–101° C.; 1H-NMR (DMSO-d6) δ 0.76 (t, 3H, J=7.5 Hz), 1.8–2.0 (m, 2H), 3.38 (t, 3H, J=5.7 Hz), 6.8 (dt, 1H, J=7.69, 0.45 Hz), 6.93 (dt, 1H, J=7.45, 1.10 Hz), 7.15 (m, 1H), 7.22 (m, 1H), 10.3 (s, 1H); MS (ESI) m/z 270 [M+H].

후처리

  1. extractionextracted with EtOAc (2×)
  2. washthe combined organic layers were washed with dil. HCl, water, brine
  3. dry with materialdried (MgSO4)
  4. concentrationconcentrated
  5. customThe residual oil was triturated with hexane
  6. customto afford the crude product (24.5 g, 51%)
  7. customA sample (3 g) was recrystallized from EtOAc/hexane

출처 및 근거

ORD 기록
ord-1ed7f37270af420fb0e5d51ef1f37326
출처 데이터셋
uspto-grants-2006_08
특허 번호
US07084168B2

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