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Imidazole → 1-(tert-Butyl) 2-methyl (2R,4R)-4-((tert-butyldimethylsilyl)oxy)pyrrolidine-1,2-dicarboxylate

HRID 908448
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HRID 908448 반응식
[Si:1](Cl)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[OH:9][C@H:10]1[CH2:14][N:13]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[C@@H:12]([C:22]([O:24][CH3:25])=[O:23])[CH2:11]1.N1C=CN=C1>CN(C=O)C>[C:4]([Si:1]([CH3:3])([CH3:2])[O:9][C@H:10]1[CH2:14][N:13]([C:15]([O:17][C:18]([CH3:19])([CH3:20])[CH3:21])=[O:16])[C@@H:12]([C:22]([O:24][CH3:25])=[O:23])[CH2:11]1)([CH3:7])([CH3:6])[CH3:5]
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참가 물질

5

반응물 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 6951202(2R,4R)-4-Hydroxy-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester

생성물 1

HCID 141170031-(tert-Butyl) 2-methyl (2R,4R)-4-((tert-butyldimethylsilyl)oxy)pyrrolidine-1,2-dicarboxylate수율 51.1%

시약·촉매·용매 1

HCID 6228Dimethylformamide
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온도
20 °C

실험 절차

Tert-Butyldimethylsilylchloride (9.36 g) was added to a mixture of O1-tert-butyl O2-methyl (2R,4R)-4-hydroxypyrrolidine-1,2-dicarboxylate (13.83 g) and imidazole (9.61 g) in DMF (100 ml). The reaction was stirred at 20° C. for 19 hours and then evaporated to dryness. The residues were slurried in diethyl ether and filtered. The filtrate was evaporated to dryness and the residues purified by flash chromatography on silica eluting with increasingly polar mixtures of methanol/dichloromethane (0/100-5/95). Fractions containing the desired product were combined and evaporated to dryness to give O1-tert-butyl O2-methyl (2R,4R) 4-(tert-butyl-dimethyl-silyl)oxypyrrolidine-1,2-dicarboxylate (10.35 g) as a colourless oil. NMR Spectrum: (DMSOd6) 0.00 (6H, s); 0.80 (9H, s); 1.32-1.38 (9H, m); 1.84-1.89 (1H, m); 2.30-2.35 (1H, m); 3.06-3.10 (1H, m); 3.49 (1H, q); 3.59 (3H, d); 4.22-4.26 (1H, m); 4.37 (1H, d).

후처리

  1. customevaporated to dryness
  2. filtrationfiltered
  3. customThe filtrate was evaporated to dryness
  4. customthe residues purified by flash chromatography on silica eluting
  5. temperaturewith increasingly polar mixtures of methanol/dichloromethane (0/100-5/95)
  6. additionFractions containing the desired product
  7. customevaporated to dryness

출처 및 근거

ORD 기록
ord-b983c52ee7f1441f99f8184f294ddef7
출처 데이터셋
uspto-grants-2011_09
DOI
10.6084/m9.figshare.5104873.v1
특허 번호
US08017611B2

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