7-bromo-2-[2-(3,5-dimethoxyphenyl)ethyl]-6-[4-(4-methylpiperazin-1-yl)phenyl]-5H-pyrrolo[2,3-b]pyrazine → 2-[2-(3,5-dimethoxyphenyl)ethyl]-7-methyl-6-[4-(4-methylpiperazin-1-yl)phenyl]-5H-pyrrolo[2,3-b]pyrazine

HRID 1052272Notes

Reaction equation

Br[C:2]1[C:10]2[C:5](=[N:6][CH:7]=[C:8]([CH2:11][CH2:12][C:13]3[CH:18]=[C:17]([O:19][CH3:20])[CH:16]=[C:15]([O:21][CH3:22])[CH:14]=3)[N:9]=2)[NH:4][C:3]=1[C:23]1[CH:28]=[CH:27][C:26]([N:29]2[CH2:34][CH2:33][N:32]([CH3:35])[CH2:31][CH2:30]2)=[CH:25][CH:24]=1.[CH3:36][Zn]C>O1CCOCC1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[CH3:22][O:21][C:15]1[CH:14]=[C:13]([CH2:12][CH2:11][C:8]2[N:9]=[C:10]3[C:2]([CH3:36])=[C:3]([C:23]4[CH:28]=[CH:27][C:26]([N:29]5[CH2:34][CH2:33][N:32]([CH3:35])[CH2:31][CH2:30]5)=[CH:25][CH:24]=4)[NH:4][C:5]3=[N:6][CH:7]=2)[CH:18]=[C:17]([O:19][CH3:20])[CH:16]=1

Participants

Conditions

Temperature: 90 °C

Procedure

To a stirred solution of 7-bromo-2-[2-(3,5-dimethoxyphenyl)ethyl]-6-[4-(4-methylpiperazin-1-yl)phenyl]-5H-pyrrolo[2,3-b]pyrazine (from Example 46, 20.0 mg, 37.3 μmol) and Pd(dppf)Cl2 (2.7 mg, 3.7 μmol) in 1,4-dioxane (0.8 mL), dimethylzinc (2.0 M in toluene, 47 μL, 94.0 μmol) was added at ambient temperature. The reaction mixture was then warmed up to 90° C. After 4 hours, the volatiles were removed and the residue was purified on RP-HPLC (XBridge C18 column, eluting with a gradient of acetonitrile/water containing 0.05% TFA, at flow rate of 30 mL/min) to give the desired product (4.2 mg) as its TFA salt. LCMS calculated for C28H34N5O2 (M+H)+: m/z=472.2. Found: 472.2.

Workup

customthe volatiles were removed
customthe residue was purified on RP-HPLC (XBridge C18 column
washeluting with a gradient of acetonitrile/water containing 0.05% TFA, at flow rate of 30 mL/min)

Sources & evidence

ORD record: ord-02036e041d4549f5871b032ba4cea7d6
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09388185B2

Reaction notes

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