Cesium fluoride → tert-Butyl (1-{4-[2-(1,3-benzoxazol-2-yl)-9H-imidazo[1,2-d]pyrido[2,3-b][1,4]benzodiazepin-3-yl]phenyl}cyclobutyl)carbamate

HRID 1047068Notes

Reaction equation

HRID 1047068 reaction equation
Br[C:2]1[N:3]=[C:4]2[C:10]3[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=3[NH:8][C:7]3[N:15]=[CH:16][CH:17]=[CH:18][C:6]=3[N:5]2[C:19]=1[C:20]1[CH:25]=[CH:24][C:23]([C:26]2([NH:30][C:31](=[O:37])[O:32][C:33]([CH3:36])([CH3:35])[CH3:34])[CH2:29][CH2:28][CH2:27]2)=[CH:22][CH:21]=1.C([Sn](CCCC)(CCCC)[C:43]1[O:44][C:45]2[CH:51]=[CH:50][CH:49]=[CH:48][C:46]=2[N:47]=1)CCC.[F-].[Cs+]>O1CCOCC1.O.CC(C)([P](C(C)(C)C)([Pd][P](C(C)(C)C)(C(C)(C)C)C(C)(C)C)C(C)(C)C)C>[O:44]1[C:45]2[CH:51]=[CH:50][CH:49]=[CH:48][C:46]=2[N:47]=[C:43]1[C:2]1[N:3]=[C:4]2[C:10]3[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=3[NH:8][C:7]3[N:15]=[CH:16][CH:17]=[CH:18][C:6]=3[N:5]2[C:19]=1[C:20]1[CH:25]=[CH:24][C:23]([C:26]2([NH:30][C:31](=[O:37])[O:32][C:33]([CH3:36])([CH3:35])[CH3:34])[CH2:29][CH2:28][CH2:27]2)=[CH:22][CH:21]=1

Participants

7

Reactant 3

HCID 25953Cesium fluorideHCID 37665862-(Tributylstannyl)-1,3-benzoxazoleHCID 136331865tert-butyl {1-[4-(2-bromo-9H-imidazo[1,2-d]pyrido[2,3-b][1,4]benzodiazepin-3-yl)phenyl]cyclobutyl}carbamate

Product 1

HCID 86664673tert-Butyl (1-{4-[2-(1,3-benzoxazol-2-yl)-9H-imidazo[1,2-d]pyrido[2,3-b][1,4]benzodiazepin-3-yl]phenyl}cyclobutyl)carbamateYield 21.2%

Reagents, catalysts & solvents 3

HCID 178418851HCID 178418851, compoundCatalystHCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
130 °C

Procedure

A mixture of tert-butyl {1-[4-(2-bromo-9H-imidazo[1,2-d]pyrido[2,3-b][1,4]benzodiazepin-3-yl)phenyl]cyclobutyl}carbamate (50.0 mg, 0.0895 mmol), 2-(tributylstannyl)-1,3-benzoxazole (81.2 mg, 0.179 mmol), bis (tri-tert-butylphosphine)palladium(0) (9.15 mg, 0.0179 mmol) and cesium fluoride (88.4 mg, 0.582 mmol) in 1,4-dioxane (1.00 mL) was heated at 130° C. under microwave irradiation for 2 hours under nitrogen. After cooling to room temperature, the mixture was diluted with water and extracted with EtOAc (×3). The combined organic layer was dried over anhydrous Na2SO4 and concentrated. The residue was purified by PTLC (EtOAc/hexane=1:1, DCM/EtOAc=1:1) to afford desired product (11.3 mg, 21.2%) as white solid. 1HNMR (CDCl3) 500 MHz δ: 8.27 (dd, J=7.7, 1.7 Hz, 1H), 8.08-8.02 (m, 1H), 7.75-7.68 (m, 1H), 7.52-7.38 (m, 5H), 7.37-7.25 (m, 3H), 7.20-7.14 (m, 1H), 6.98 (d, J=8.0 Hz, 1H), 6.92-6.81 (m, 1H), 6.63 (dd, J=8.0, 4.6 Hz, 1H), 6.45 (s, 1H), 5.20 (s, 1H), 2.68-2.25 (m, 4H), 2.22-2.09 (m, 1H), 1.97-1.86 (m, 1H), 1.54-1.11 (m, 9H).

Workup

  1. temperatureAfter cooling to room temperature
  2. extractionextracted with EtOAc (×3)
  3. dry with materialThe combined organic layer was dried over anhydrous Na2SO4
  4. concentrationconcentrated
  5. customThe residue was purified by PTLC (EtOAc/hexane=1:1, DCM/EtOAc=1:1)

Sources & evidence

ORD record
ord-90d60d763f9b433d89fdfb69a7faf24f
Source dataset
uspto-grants-2013_10
Patent number
US08569331B2

Reaction notes

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