Nitrogen → (S)-methyl 4-(1,3-dioxoisoindolin-2-yloxy)-2-methoxybutanoate

HRID 1917484ノート

反応式

HRID 1917484 の反応式
[OH:1][CH2:2][CH2:3][C@H:4]([O:9][CH3:10])[C:5]([O:7][CH3:8])=[O:6].O[N:12]1[C:20](=[O:21])[C:19]2[C:14](=[CH:15][CH:16]=[CH:17][CH:18]=2)[C:13]1=[O:22].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C.N#N>C(Cl)Cl.O>[O:22]=[C:13]1[C:14]2[C:19](=[CH:18][CH:17]=[CH:16][CH:15]=2)[C:20](=[O:21])[N:12]1[O:1][CH2:2][CH2:3][C@H:4]([O:9][CH3:10])[C:5]([O:7][CH3:8])=[O:6]

参加物

8

反応物 5

HCID 947NitrogenHCID 10665N-HydroxyphthalimideHCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 57999131(S)-methyl 4-hydroxy-2-methoxybutanoate

生成物 1

HCID 67065361(S)-methyl 4-(1,3-dioxoisoindolin-2-yloxy)-2-methoxybutanoate収率 42.6%

試薬・触媒・溶媒 2

HCID 962Water溶媒HCID 6344Dichloromethane溶媒

実験手順

To a solution of (S)-methyl 4-hydroxy-2-methoxybutanoate (46b, 1.48 g, 10.0 mmol) in CH2Cl2 (25.0 mL) was added 2-hydroxyisoindoline-1,3-dione (1.63 g, 10.0 mmol) and triphenylphosphine (3.93 g, 15.0 mmol). The resultant mixture was cooled to 0° C. and diisopropylazodicarboxylate (2.95 ml, 15.0 mmol) was slowly added drop wise under N2 atmosphere. The reaction mixture was stirred at ambient temperature for 48 h. To the reaction mixture, H2O (100 mL) was added and extracted with CH2Cl2. The organic layers washed with brine. Dried over anhydrous Na2SO4, filtered and concentrated to provide yellow oil, which was purified by flash chromatography (50% EtOAc-hexane) to afford (S)-methyl 4-(1,3-dioxoisoindolin-2-yloxy)-2-methoxybutanoate (46c, 1.25 g, 42%) as light yellow oil. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.98-2.10 (m, 1H) 2.23-2.37 (m, 1H) 3.51 (s, 3H) 3.79 (s, 3H) 4.24 (dd, J=9.47, 3.66 Hz, 1H) 4.31-4.40 (m, 2H) 7.74-7.82 (m, 2H) 7.81-7.90 (m, 2H).

後処理

  1. extractionextracted with CH2Cl2
  2. washThe organic layers washed with brine
  3. dry with materialDried over anhydrous Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customto provide yellow oil, which
  7. customwas purified by flash chromatography (50% EtOAc-hexane)

出典と根拠

ORDレコード
ord-87434ca2a148497199ebf6a829f621b1
出典データセット
uspto-grants-2013_12
特許番号
US08618290B2

反応ノート

読み込み中…