Triethylamine → 2-oxo-2-phenylethyl (3R,4S)-4-allyl-3-azido-1-[N-benzyl-N-(tert-butoxycarbonyl)glycyl]pyrrolidine-3-carboxylate

HRID 61408Notes

Reaction equation

HRID 61408 reaction equation
FC(F)(F)C(O)=O.[CH2:8]([C@H:11]1[CH2:15][NH:14][CH2:13][C@@:12]1([N:28]=[N+:29]=[N-:30])[C:16]([O:18][CH2:19][C:20](=[O:27])[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1)=[O:17])[CH:9]=[CH2:10].[CH2:31]([N:38]([C:43]([O:45][C:46]([CH3:49])([CH3:48])[CH3:47])=[O:44])[CH2:39][C:40](O)=[O:41])[C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1.CCN(CC)CC.F[P-](F)(F)(F)(F)F.C[N+](C)=C(N(C)C)ON1C2N=CC=CC=2N=N1>C(Cl)Cl>[CH2:8]([C@H:11]1[CH2:15][N:14]([C:40](=[O:41])[CH2:39][N:38]([CH2:31][C:32]2[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=2)[C:43]([O:45][C:46]([CH3:49])([CH3:47])[CH3:48])=[O:44])[CH2:13][C@@:12]1([N:28]=[N+:29]=[N-:30])[C:16]([O:18][CH2:19][C:20](=[O:27])[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1)=[O:17])[CH:9]=[CH2:10]

Participants

6

Reactant 4

HCID 8471TriethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 105158162-(Benzyl(tert-butoxycarbonyl)amino)acetic acidHCID 131734495racemic 2-oxo-2-phenylethyl (3R,4S)-4-allyl-3-azidopyrrolidine-3-carboxylate trifluoroacetate

Product 1

HCID 1182160362-oxo-2-phenylethyl (3R,4S)-4-allyl-3-azido-1-[N-benzyl-N-(tert-butoxycarbonyl)glycyl]pyrrolidine-3-carboxylateYield 65%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A stirred mixture of the crude racemic 2-oxo-2-phenylethyl (3R,4S)-4-allyl-3-azidopyrrolidine-3-carboxylate trifluoroacetate (Step 1, ˜1 mmol) and N-benzyl-N-(tert-butoxycarbonyl)glycine (337 mg, 1.27 mmol) in methylene chloride (9 mL) was treated with Et3N (0.495 mL, 3.55 mmol) followed by N,N,N′,N′-tetramethyl-O-(7-azabenzotriazol-1-yl)uronium hexafluorophosphate (HATU, 502 mg, 1.32 mmol), and the resulting mixture was stirred at room temperature and monitored by HPLC. At 1 h, the reaction was diluted with methylene chloride (20 mL), washed with water (20 mL), 1N aqueous HCl (10 mL), saturated aqueous NaHCO3 (20 mL) and saturated aqueous sodium chloride (10 mL), dried over Na2SO4, and concentrated under reduced pressure. Purification by silica gel chromatography (40 g column, 15-30% ethyl acetate in hexanes) gave 2-oxo-2-phenylethyl (3R,4S)-4-allyl-3-azido-1-[N-benzyl-N-(tert-butoxycarbonyl)glycyl]pyrrolidine-3-carboxylate (365 mg, 64%) as an amber gum which was used as is in the next step. LC-MS ESI+MS found for C30H35N5O6 m/z 562.3 (M+H), 584.3 (M+Na), 1H NMR (CDCl3, 400 MHz) δ 7.92 (m, 2 H), 7.66 (m, 1 H), 7.53 (m, 2 H), 7.30 (m, 5 H), 5.75 (m, 1 H), 5.52 (m, 2 H), 5.12 (m, 2 H), 4.58 (m, 2 H), 4.22-3.42 (m, 6 H), 2.60 (m, 1 H), 2.50 (m, 1 H), 2.12 (m, 1 H), 1.48 (s, 9 H).

Workup

  1. washwashed with water (20 mL), 1N aqueous HCl (10 mL), saturated aqueous NaHCO3 (20 mL) and saturated aqueous sodium chloride (10 mL)
  2. dry with materialdried over Na2SO4
  3. concentrationconcentrated under reduced pressure
  4. customPurification by silica gel chromatography (40 g column, 15-30% ethyl acetate in hexanes)

Sources & evidence

ORD record
ord-7df8981707354bcc8ca054e4f7099a1a
Source dataset
uspto-grants-2016_09
Patent number
US09440995B2

Reaction notes

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