Imidazole → Benzyl trans(+/-)-4-[(tert-butoxycarbonyl)amino]-3-{[tert-butyl(dimethyl)silyl]oxy}piperidine-1-carboxylate

HRID 921643ノート

反応式

HRID 921643 の反応式
[C:1]([Si:5]([CH3:8])([CH3:7])Cl)([CH3:4])([CH3:3])[CH3:2].[C:9]([O:13][C:14]([NH:16][C@@H:17]1[CH2:22][CH2:21][N:20]([C:23]([O:25][CH2:26][C:27]2[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=2)=[O:24])[CH2:19][C@H:18]1[OH:33])=[O:15])([CH3:12])([CH3:11])[CH3:10].N1C=CN=C1>CN(C=O)C>[C:9]([O:13][C:14]([NH:16][C@@H:17]1[CH2:22][CH2:21][N:20]([C:23]([O:25][CH2:26][C:27]2[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=2)=[O:24])[CH2:19][C@H:18]1[O:33][Si:5]([C:1]([CH3:4])([CH3:3])[CH3:2])([CH3:8])[CH3:7])=[O:15])([CH3:12])([CH3:10])[CH3:11]

参加物

5

反応物 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 58745562(3R,4R)-Benzyl 4-((tert-butoxycarbonyl)amino)-3-hydroxypiperidine-1-carboxylate

生成物 1

HCID 60200764Benzyl trans(+/-)-4-[(tert-butoxycarbonyl)amino]-3-{[tert-butyl(dimethyl)silyl]oxy}piperidine-1-carboxylate

試薬・触媒・溶媒 1

HCID 6228Dimethylformamide溶媒

実験手順

tert-butyldimethylchlorosilane (6.51 g, 43.2 mmol) was added to a solution of (+/−)(3R,4R)-benzyl 4-((tert-butoxycarbonyl)amino)-3-hydroxypiperidine-1-carboxylate (prepared according to a published literature procedure: Fink, Brian, et al., WO 2005/066176, 10.1 g, 28.8 mmol) and imidazole (3.92 g, 57.6 mmol) in DMF (60 mL). The mixture was stirred at room temperature overnight. Ice water was added and the reaction mixture was extracted with ether twice, the combined extracts were washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuo, the crude product was purified by flash chromatography on silica gel using an automated ISCO system (330 g column, eluting with 5-20% ethyl acetate/dichloromethane) to give (+/−)-(3R,4R)-benzyl 4-((tert-butoxycarbonyl)amino)-3-((tert-butyldimethylsilyl)oxy)piperidine-1-carboxylate (13.3 g) as a white solid.

後処理

  1. customprepared
  2. extractionthe reaction mixture was extracted with ether twice
  3. washthe combined extracts were washed with brine
  4. dry with materialdried over magnesium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customthe crude product was purified by flash chromatography on silica gel using
  8. washan automated ISCO system (330 g column, eluting with 5-20% ethyl acetate/dichloromethane)

出典と根拠

ORDレコード
ord-0d44b67529e44c09851173bbf6f35e01
出典データセット
uspto-grants-2016_03
特許番号
US09273057B2

反応ノート

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