Isopropyl iodide → 2-Cyano-2-(3,4-dimethoxyphenyl)-2-isopropylethyl-1,3-dioxolane

HRID 405014ノート

反応式

HRID 405014 の反応式
C([Li])CCC.C(NC(C)C)(C)C.[CH3:13][O:14][C:15]1[CH:16]=[C:17]([CH:23](CCC2OCCO2)[C:24]#[N:25])[CH:18]=[CH:19][C:20]=1[O:21][CH3:22].BrCCC1OCCO1.C[O:42][C:43]1[CH:44]=[C:45]([CH2:51]C#N)[CH:46]=[CH:47][C:48]=1[O:49]C.IC(C)C.[NH4+].[Cl-]>C1COCC1.C(OCC)C>[C:24]([C:23]1([C:17]2[CH:18]=[CH:19][C:20]([O:21][CH3:22])=[C:15]([O:14][CH3:13])[CH:16]=2)[O:49][CH:48]([CH2:47][CH2:46][CH:45]([CH3:51])[CH3:44])[CH2:43][O:42]1)#[N:25]

参加物

10

反応物 7

HCID 6362Isopropyl iodideHCID 7912Diisopropylamine2 回HCID 25517Ammonium ChlorideHCID 667273,4-DimethoxybenzeneacetonitrileHCID 877762-(2-Bromoethyl)-1,3-dioxolaneHCID 426012402-(3,4-Dimethoxyphenyl)-4-(1,3)-dioxolan-2-yl-butyronitrileHCID 178418339Butyllithium2 回

生成物 1

HCID 671041742-Cyano-2-(3,4-dimethoxyphenyl)-2-isopropylethyl-1,3-dioxolane収率 49%

試薬・触媒・溶媒 2

HCID 3283Diethyl Ether溶媒HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
-78 °C

実験手順

A solution of butyllithium (1.6 M solution in hexanes, 7.0 mL, 11.2 mmol) was added via syringe to a solution of diisopropylamine (1.5 mL, 10.61 mmol) in anhydrous THF (25 mL) at −78° C. And then a solution of 2-(3,4-dimethoxyphenyl)-4-(1,3)-dioxolan-2-yl-butyronitrile (18) (709 mg, 2.56 mmol) (previously prepared by reacting 2-(2-bromoethyl)-1,3-dioxolane with 2-(3,4-dimethoxyphenyl)-acetonitrile (14) in a solution diisopropylamine to which butyllithium was added) in THF (10 mL) was added via syringe. The mixture was stirred at −78° C. for five minutes and then 2-iodopropane (0.4 mL, 3.96 mmol) was added. The mixture was stirred at −78° C. for five hours and then at room temperature for 17.5 hours., Saturated NH4Cl solution (10 mL) was added to quench the reaction. Ethyl ether (60 mL) was added and the etheral solution was isolated. The aqueous solution was extracted with ether (2×20 mL). After washing with brine, drying with sodium sulfate, the solvent was removed under reduced pressure and the residue was purified by flash column chromatography on SiO2 using EtOAc/hexanes (0-30%) to afford the product (19) (397 mg) in 49% yield. 1H-NMR (CDCl3): δ 6.86-6.82 (m, 3 H), 4.80 (t, J=4.2-4.8 Hz, 1 H), 3.95-3.77 (m, 4 H), 3.878 (s, 3 H), 3.867 (s, 3 H), 2.24 (dt, J=3.9-4.2 Hz, J=12.9-13.2 Hz, 1 H), 2.11-2.02 (m, 1 H), 1.91 (dt, J=3.9 Hz, J=12.6 Hz, 1 H), 1.72 (tt, J=3.9-4.2 Hz, J=12.6-13.2 Hz, 1 H), 1.37-1.24 (m, 1 H), 1.16 (d, J=6.6 Hz, 3 H), 0.80 (d, J=6.9 Hz, 3 H). LC-MS: 342.083 (MNa+).

後処理

  1. additionwas added via syringe
  2. stirringThe mixture was stirred at −78° C. for five hours
  3. waitat room temperature for 17.5 hours
  4. customto quench
  5. customthe reaction
  6. customthe etheral solution was isolated
  7. extractionThe aqueous solution was extracted with ether (2×20 mL)
  8. washAfter washing with brine
  9. dry with materialdrying with sodium sulfate
  10. customthe solvent was removed under reduced pressure
  11. customthe residue was purified by flash column chromatography on SiO2

出典と根拠

ORDレコード
ord-762520ed386b43c4862afa5a09128d89
出典データセット
uspto-grants-2014_06
特許番号
US08748648B2

反応ノート

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