Diisopropylethylamine → Methyl ((S)-3-methyl-1-oxo-1-((S)-2-(5-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1H-imidazol-2-yl)pyrrolidin-1-yl)butan-2-yl)carbamate

HRID 71673Notes

Reaction equation

HRID 71673 reaction equation
C(N(C(C)C)CC)(C)C.Cl.[NH:11]1[CH2:15][CH2:14][CH2:13][C@H:12]1[C:16]1[NH:17][C:18]([C:21]2[CH:26]=[CH:25][C:24]([B:27]3[O:31][C:30]([CH3:33])([CH3:32])[C:29]([CH3:35])([CH3:34])[O:28]3)=[CH:23][CH:22]=2)=[CH:19][N:20]=1.F[P-](F)(F)(F)(F)F.N1(OC(N(C)C)=[N+](C)C)C2N=CC=CC=2N=N1.[CH3:60][O:61][C:62]([NH:64][C@@H:65]([CH:69]([CH3:71])[CH3:70])[C:66](O)=[O:67])=[O:63]>CN(C)C=O.C(OCC)(=O)C>[CH3:60][O:61][C:62](=[O:63])[NH:64][C@H:65]([C:66]([N:11]1[CH2:15][CH2:14][CH2:13][C@H:12]1[C:16]1[NH:17][C:18]([C:21]2[CH:26]=[CH:25][C:24]([B:27]3[O:31][C:30]([CH3:33])([CH3:32])[C:29]([CH3:35])([CH3:34])[O:28]3)=[CH:23][CH:22]=2)=[CH:19][N:20]=1)=[O:67])[CH:69]([CH3:71])[CH3:70]

Participants

7

Reactant 4

HCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 10942966(2S)-2-((methoxycarbonyl)amino)-3-methylbutanoic acidHCID 66620496(S)-2-(pyrrolidin-2-yl)-5-(4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)phenyl)-1H-imidazole hydrochloride

Product 1

HCID 57462153Methyl ((S)-3-methyl-1-oxo-1-((S)-2-(5-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1H-imidazol-2-yl)pyrrolidin-1-yl)butan-2-yl)carbamateYield 68.2%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

Diisopropylethylamine (7.63 mL, 43.8 mmol) was added to a suspension of (S)-2-pyrrolidin-2-yl-5-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1H-imidazole hydrochloride (7.33 g, 19.5 mmol), O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (7.6 g, 19.9 mmol) and (S)-2-methoxycarbonylamino-3-methyl-butyric acid (3.59 g, 20.5 mmol) in dimethylformamide (75 mL). All solids dissolved. After 30 min the reaction mixture was diluted with ethyl acetate (300 mL) and was washed with ½ saturated sodium chloride (1×300 mL), half saturated sodium bicarbonate (2×150 mL) and brine (1×100 mL). The organic phase was dried with sodium sulfate, filtered and the solvent was removed under reduced pressure. The resulting tan foam was subjected to silica gel chromatography with eluate of 20-100% ethyl acetate and hexanes, to provide (S,S)-[2-methyl-1-(2-{5-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carbonyl)-propyl]-carbamic acid methyl ester (6.6 g, 68%) as a white foam: 1H (DMSO-d6): δ=11.81 (br s, 1H), 7.72 (m, 2H), 7.61 (m, 2H), 7.51 (br s, 1H), 7.27 (d, J=8.4 Hz, 1H), 5.05 (m, 1H), 4.04 (m, 2H), 3.78 (m, 2H), 3.52 (s, 3H), 2.11 (m, 2H), 1.93 (m, 2H), 1.28 (s, 12H), 0.85 (dd, J1=6.6 Hz, J2=11.4 Hz, 6H).

Workup

  1. dissolutionAll solids dissolved
  2. washwas washed with ½ saturated sodium chloride (1×300 mL), half saturated sodium bicarbonate (2×150 mL) and brine (1×100 mL)
  3. dry with materialThe organic phase was dried with sodium sulfate
  4. filtrationfiltered
  5. customthe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-814125c417d244bca6798246917c738c
Source dataset
uspto-grants-2014_09
Patent number
US08822430B2

Reaction notes

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