Formaldehyde → (S)-benzyl 4-(3-(1,3-dioxoisoindolin-2-yl)propyl)-5-oxooxazolidine-3-carboxylate

HRID 409812

反応式

HRID 409812 の反応式
[NH2:1][CH2:2][CH2:3][CH2:4][C@H:5]([NH:9][C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:11])[C:6]([OH:8])=[O:7].[O:20]=[C:21]1[C:29]2[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=2)[C:23](=[O:30])N1C(OCC)=O.C=O.[CH3:38]C1C=CC(S(O)(=O)=O)=CC=1>CN1C(=O)CCC1.CCOC(C)=O.C1(C)C=CC=CC=1.CCOCC>[O:20]=[C:21]1[C:29]2[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=2)[C:23](=[O:30])[N:1]1[CH2:2][CH2:3][CH2:4][C@H:5]1[C:6](=[O:8])[O:7][CH2:38][N:9]1[C:10]([O:12][CH2:13][C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1)=[O:11]

参加物

9

反応物 4

HCID 712FormaldehydeHCID 6101p-Toluenesulfonic acidHCID 31187N-CarbethoxyphthalimideHCID 7010490N-alpha-Benzyloxycarbonyl-L-ornithine

生成物 1

HCID 54380156(S)-benzyl 4-(3-(1,3-dioxoisoindolin-2-yl)propyl)-5-oxooxazolidine-3-carboxylate収率 76%

試薬・触媒・溶媒 4

HCID 1140Toluene溶媒HCID 3283Diethyl Ether溶媒HCID 8857Ethyl Acetate溶媒HCID 13387N-methyl-2-pyrrolidone溶媒

反応条件

温度
150 °C

実験手順

(S)-5-amino-2-(benzyloxycarbonylamino)pentanoic acid (10.0 g, 37.56 mmol) and ethyl 1,3-dioxoisoindoline-2-carboxylate (9.04 g, 41.28 mmol) in NMP (40.0 mL) were heated to 150° C. for 30 min in 4 microwave reaction tubes. The mixture was diluted with EtOAc (500 mL). The organic mixture was washed with water (100 mL×2) and brine, dried over Na2SO4, filtered, and concentrated under reduced pressure to give an oil, which was redissolved in toluene. To the resulting solution were added paraformaldehyde, PTSA and molecular sieves (3 A) and the mixture was heated to 150° C. for 20 min in a microwave reactor. The reaction mixture was diluted with ether (800 mL), washed with NaHCO3 and brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified on silica gel using a mixture of EtOAc and hexanes to give (S)-benzyl 4-(3-(1,3-dioxoisoindolin-2-yl)propyl)-5-oxooxazolidine-3-carboxylate (11.6 g, 76% for 2 steps).

後処理

  1. washThe organic mixture was washed with water (100 mL×2) and brine
  2. dry with materialdried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated under reduced pressure
  5. customto give an oil, which
  6. washwashed with NaHCO3 and brine
  7. dry with materialdried over Na2SO4
  8. filtrationfiltered
  9. concentrationconcentrated under reduced pressure
  10. customThe residue was purified on silica gel using
  11. additiona mixture of EtOAc and hexanes

出典と根拠

ORDレコード
ord-8dfdc3cb80874c57b1b82ff6040b4b5a
出典データセット
uspto-grants-2014_06
特許番号
US08759374B2

関連ノート

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