Reaction #1884989

ord-a99d6cb957ad4267b7111cc3de29a7e9

Reaction equation

C=CCCCN(C[C@H](C(=O)OC(C)(C)C)C(=O)N1C[C@H](O)C[C@H]1C(=O)N[C@]1(C(=O)OCC)C[C@H]1C=C)C1CC1
compound 1c
C=CCCCN(C[C@H](C(=O)OC(C)(C)C)C(=O)N1C[C@H](O)C[C@H]1C(=O)N[C@]1(C(=O)OCC)C[C@H]1C=C)C1CC1
(1R,2S)-ethyl 1-((3R,5S)-1-((S)-2-(tert-butoxycarbonyl)-3-(cyclopropyl(pent-4-enyl)amino)propanoyl)-3-hydroxypyrrolidine-5-carboxamido)-2-vinylcyclopropanecarboxylate
c1c[nH]cn1
imidazole
CC(C)(C)[Si](C)(C)Cl
tert-butyldimethylsilyl chloride
→
C=CCCCN(C[C@H](C(=O)OC(C)(C)C)C(=O)N1C[C@H](O[Si](C)(C)C(C)(C)C)C[C@H]1C(=O)N[C@]1(C(=O)OCC)C[C@H]1C=C)C1CC1
(1R,2S)-ethyl 1-((3R,5S)-1-((S)-2-(tert-butoxycarbonyl)-3-(cyclopropyl(pent-4-enyl)amino)propanoyl)-3-(tert-butyldimethylsilyloxy)pyrrolidine-5-carboxamido)-2-vinylcyclopropanecarboxylate
Yield 94.0%

Reactants

C=CCCCN(C[C@H](C(=O)OC(C)(C)C)C(=O)N1C[C@H](O)C[C@H]1C(=O)N[C@]1(C(=O)OCC)C[C@H]1C=C)C1CC1
compound 1c
C=CCCCN(C[C@H](C(=O)OC(C)(C)C)C(=O)N1C[C@H](O)C[C@H]1C(=O)N[C@]1(C(=O)OCC)C[C@H]1C=C)C1CC1
(1R,2S)-ethyl 1-((3R,5S)-1-((S)-2-(tert-butoxycarbonyl)-3-(cyclopropyl(pent-4-enyl)amino)propanoyl)-3-hydroxypyrrolidine-5-carboxamido)-2-vinylcyclopropanecarboxylate
c1c[nH]cn1
imidazole
CC(C)(C)[Si](C)(C)Cl
tert-butyldimethylsilyl chloride

Reagents

None

Solvents

CN(C)C=O
DMF

Conditions

Detailed conditions
See reaction.notes.procedure_details.

Workup

  1. 1
    Concentrationconcentrated in vacuo
  2. 2
    Otherpartitioned between ethyl acetate and water
  3. 3
    DryingThe organic phase was dried over magnesium sulfate
  4. 4
    Concentrationconcentrated in vacuo
  5. 5
    Otherto obtain an off-white solid
  6. 6
    WashFlash chromatography (eluting with methylene chloride

Procedure

To a mixture of compound 1c (1.55 g, 2.75 mmoL) in 10 mL of DMF was added imidazole (0.47 g, 6.88 mmoL) and tert-butyldimethylsilyl chloride (826 mg, 5.50 mmoL). The mixture was stirred at rt for 18 h, concentrated in vacuo, and partitioned between ethyl acetate and water. The organic phase was dried over magnesium sulfate, and concentrated in vacuo to obtain an off-white solid. Flash chromatography (eluting with methylene chloride and then ethyl acetate) gave (1R,2S)-ethyl 1-((3R,5S)-1-((S)-2-(tert-butoxycarbonyl)-3-(cyclopropyl(pent-4-enyl)amino)propanoyl)-3-(tert-butyldimethylsilyloxy)pyrrolidine-5-carboxamido)-2-vinylcyclopropanecarboxylate 1d as a white solid (1.75 g, 94%): LC-MS (Phenomenex 10 μm C18 HPLC column: 3.0×50 mm length. Gradient: 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B. Gradient time: 2 min. Hold time: 1 min. Flow rate: 5 mL/min. Detector Wavelength: 220 nm. Solvent A: 10% MeOH/90% H2O/0.1% TFA. Solvent B: 10% H2O/90% MeOH/0.1% TFA.) (Retention time: 2.51 min), MS m/z 677 (M++1).

Source

DOI: 10.6084/m9.figshare.5104873.v1Patent: US08343477B2uspto-grants-2013_01