1,8-Diazabicyclo(5.4.0)undec-7-ene → 3 Cyclopentyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2.3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile

HRID 334223Notes

Reaction equation

[CH:1]1([CH:6]=[CH:7][C:8]#[N:9])[CH2:5][CH2:4][CH2:3][CH2:2]1.C1CCN2C(=NCCC2)CC1.[NH:21]1[CH:25]=[C:24]([C:26]2[C:27]3[CH:34]=[CH:33][N:32]([CH2:35][O:36][CH2:37][CH2:38][Si:39]([CH3:42])([CH3:41])[CH3:40])[C:28]=3[N:29]=[CH:30][N:31]=2)[CH:23]=[N:22]1>C(#N)C.ClCCl>[CH:1]1([CH:6]([N:21]2[CH:25]=[C:24]([C:26]3[C:27]4[CH:34]=[CH:33][N:32]([CH2:35][O:36][CH2:37][CH2:38][Si:39]([CH3:42])([CH3:41])[CH3:40])[C:28]=4[N:29]=[CH:30][N:31]=3)[CH:23]=[N:22]2)[CH2:7][C:8]#[N:9])[CH2:5][CH2:4][CH2:3][CH2:2]1

Participants

Conditions

Temperature: 55 °C

Procedure

3-Cyclopentylacrylonitrile (8, 273.5 g, 2.257 mol, 1.20 equiv) and DBU (28 mL, 0.187 mol, 0.10 equiv) was added to a suspension of 4-(1H-pyrazol-4-yl)-7-(2-trimethylsilanylethoxymethyl)-7H-pyrrolo[2,3-d]pyrimidine (5, 591.8 g, 1.876 mol) in acetonitrile (4.7 L) at room temperature. The resulting reaction mixture was heated to 50-60° C. for 17 hours (a clear solution developed midway through heating) then to 70-80° C. for 8 hours. When LCMS analysis showed the reaction was deemed complete, the reaction mixture was cooled to room temperature. The cooled solution was then concentrated under reduced pressure to give the crude product (9) as a thick amber oil. The crude product was dissolved in dichloromethane (DCM) and absorbed onto silica gel then dry-loaded onto a silica column (3 Kg) packed in 33% EtOAc/heptanes. The column was eluted with 33% EtOAc/heptanes (21 L), 50% EtOAc/heptanes (28 L), 60% EtOAc/heptanes (12 L) and 75% EtOAc/heptanes (8 L). The fractions containing the desired product (9) were combined and concentrated under reduced pressure to generate a yellow oil, which was transferred to a 3 L flask with EtOAc. The solvent was removed under reduced pressure and the residual EtOAc by co-evaporating with heptanes. The residue was further dried under high vacuum for overnight to afford racemic 3-cyclopentyl-3-{4-[7-(2-trimethylsilanylethoxymethyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl]pyrazol-1-yl}propionitrile (9, racemic SEM-protected compound, 800 g, 819.1 g theoretical, 97.7% yield) as an extremely viscous yellow oil. For 9: 1H NMR (DMSO-d6, 400 MHz) δ ppm 8.83 (s, 1H), 8.75 (s, 1H), 8.39 (s, 1H), 7.77 (d, 1H, J=3.7 Hz), 7.09 (d, 1H, J=3.7 Hz), 5.63 (s, 2H), 4.53 (td, 1H, J=19.4, 4.0 Hz), 3.51 (t, 2H, J=8.1 Hz), 3.23 (dq, 2H, J=9.3, 4.3 Hz), 2.41 (m, 1H), 1.79 (m, 1H), 1.66-1.13 (m, 7H), 0.81 (t, 2H, J=8.2 Hz), 0.124 (s, 9H); C23H32N6OSi (MW, 436.63), LCMS (EI) m/e 437 (M++H) and 459 (M++Na).

Workup

customThe resulting reaction mixture
temperaturethrough heating) then to 70-80° C. for 8 hours
temperaturethe reaction mixture was cooled to room temperature
concentrationThe cooled solution was then concentrated under reduced pressure
customto give the crude product (9) as a thick amber oil
customabsorbed onto silica gel
washThe column was eluted with 33% EtOAc/heptanes (21 L), 50% EtOAc/heptanes (28 L), 60% EtOAc/heptanes (12 L) and 75% EtOAc/heptanes (8 L)
additionThe fractions containing the desired product (9)
concentrationconcentrated under reduced pressure
customwas transferred to a 3 L flask with EtOAc
customThe solvent was removed under reduced pressure
customThe residue was further dried under high vacuum for overnight

Sources & evidence

ORD record: ord-85e82601333b4a22b083225a56fe1691
Source dataset: uspto-grants-2014_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08883806B2

Reaction notes

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