1,8-Diazabicyclo(5.4.0)undec-7-ene → tert-Butyl 3-(cyanomethyl)-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)azetidine-1-carboxylate

HRID 1692973Notes

Reaction equation

HRID 1692973 reaction equation
[C:1]([CH:3]=[C:4]1[CH2:7][N:6]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:5]1)#[N:2].[NH:15]1[CH:19]=[C:18]([C:20]2[C:21]3[CH:28]=[CH:27][N:26]([CH2:29][O:30][CH2:31][CH2:32][Si:33]([CH3:36])([CH3:35])[CH3:34])[C:22]=3[N:23]=[CH:24][N:25]=2)[CH:17]=[N:16]1.C1CCN2C(=NCCC2)CC1>C(#N)C>[C:1]([CH2:3][C:4]1([N:15]2[CH:19]=[C:18]([C:20]3[C:21]4[CH:28]=[CH:27][N:26]([CH2:29][O:30][CH2:31][CH2:32][Si:33]([CH3:36])([CH3:35])[CH3:34])[C:22]=4[N:23]=[CH:24][N:25]=3)[CH:17]=[N:16]2)[CH2:7][N:6]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:5]1)#[N:2]

Participants

5

Reactant 3

HCID 811841,8-Diazabicyclo(5.4.0)undec-7-eneHCID 426313464-(1H-Pyrazol-4-yl)-7-(2-(trimethylsilyl)ethoxy)methyl-7 H-pyrrolo(2,3-d)-pyrimidineHCID 457892161-(tert-Butoxycarbonyl)-3-(cyanomethylene)azetidine

Product 1

HCID 57868843tert-Butyl 3-(cyanomethyl)-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)azetidine-1-carboxylate

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

To a suspension of tert-butyl 3-(cyanomethylene)azetidine-1-carboxylate (9, 417.2 g, 2.15 mol, 1.05 equiv) and 4-(1H-pyrazol-4-yl)-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidine (5, 645 g, 2.04 mol) in acetonitrile (4.9 L) was added DBU (30.5 mL, 0.204 mol, 0.1 equiv) drop wise at room temperature. The resulting reaction mixture was then stirred at room temperature for 3 h. After about 1 h, a clear, brown solution was obtained. When LCMS showed that no starting material remained, silica gel (SiO2, 1 Kg) was added and the mixture was concentrated to dryness under reduced pressure. This material, which contains the crude desired product (15), was then loaded onto a pre-packed silica column (SiO2, 2.5 Kg) and the column was eluted with 60-80% of ethyl acetate/heptane. The fractions containing the pure desired product (15) were combined and concentrated under reduced pressure to give the desired product as thick oil which was then stirred in heptane at room temperature until crystallization occurred. The solids were collected by filtration and washed with heptane to afford tert-butyl 3-(cyanomethyl)-3-(4-(7-((2-(trimethylsilyl)ethoxy) methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)azetidine-1-carboxylate (15, 1014.9 g, 1039.7 g theoretical, 97.6% yield) as white solids. For 15: 1H NMR (DMSO-d6, 300 MHz) δ 8.93 (s, 1H), 8.77 (s, 1H), 8.47 (s, 1H), 7.80 (d, 1H, J=3.8 Hz), 7.20 (d, 1H, J=3.7 Hz), 5.63 (s, 2H), 4.50 (d, 2H, J=9.3 Hz), 4.21 (d, 2H, J=9.3 Hz), 3.66 (s, 2H), 3.52 (t, 2H, J=7.8 Hz), 1.40 (s, 9H), 0.82 (t, 2H, J=8.1 Hz), −0.12 (s, 9H) ppm; C25H35N7O3Si (MW, 509.68), LCMS (EI) m/e 510 (M−+H) and 532 (M++Na).

Workup

  1. customThe resulting reaction mixture
  2. waitAfter about 1 h
  3. customa clear, brown solution was obtained
  4. additionsilica gel (SiO2, 1 Kg) was added
  5. concentrationthe mixture was concentrated to dryness under reduced pressure
  6. washthe column was eluted with 60-80% of ethyl acetate/heptane
  7. additionThe fractions containing the pure desired product (15)
  8. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-8878e8a573344f39a2a10e4b48373013
Source dataset
uspto-grants-2012_04
Patent number
US08158616B2

Reaction notes

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