Sodium Bicarbonate → tert-Butyl 5-(5-(5-(3-chloro-4-(thiophen-3-yl)phenyl)-1,2,4-oxadiazol-3-yl)benzofuran-2-yl)-2,2-dimethyl-1,3-dioxan-5-ylcarbamate

HRID 717697Notes

Reaction equation

HRID 717697 reaction equation
Br[C:2]1[CH:7]=[CH:6][C:5]([C:8]2[O:12][N:11]=[C:10]([C:13]3[CH:14]=[CH:15][C:16]4[O:20][C:19]([C:21]5([NH:29][C:30](=[O:36])[O:31][C:32]([CH3:35])([CH3:34])[CH3:33])[CH2:26][O:25][C:24]([CH3:28])([CH3:27])[O:23][CH2:22]5)=[CH:18][C:17]=4[CH:37]=3)[N:9]=2)=[CH:4][C:3]=1[Cl:38].[S:39]1[CH:43]=[CH:42][C:41](B(O)O)=[CH:40]1.C([O-])(O)=O.[Na+]>O1CCOCC1.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[Cl:38][C:3]1[CH:4]=[C:5]([C:8]2[O:12][N:11]=[C:10]([C:13]3[CH:14]=[CH:15][C:16]4[O:20][C:19]([C:21]5([NH:29][C:30](=[O:36])[O:31][C:32]([CH3:35])([CH3:34])[CH3:33])[CH2:26][O:25][C:24]([CH3:28])([CH3:27])[O:23][CH2:22]5)=[CH:18][C:17]=4[CH:37]=3)[N:9]=2)[CH:6]=[CH:7][C:2]=1[C:41]1[CH:42]=[CH:43][S:39][CH:40]=1

Participants

7

Reactant 3

HCID 516892Sodium BicarbonateHCID 581760Thiophene-3-boronic acidHCID 86660623tert-Butyl 5-(5-(5-(4-bromo-3-chlorophenyl)-1,2,4-oxadiazol-3-yl)benzofuran-2-yl)-2,2-dimethyl-1,3-dioxan-5-ylcarbamate

Product 1

HCID 86660624tert-Butyl 5-(5-(5-(3-chloro-4-(thiophen-3-yl)phenyl)-1,2,4-oxadiazol-3-yl)benzofuran-2-yl)-2,2-dimethyl-1,3-dioxan-5-ylcarbamateYield 71.3%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Procedure

To a stirred mixture of the product of Example 38, Step C (0.09 g, 0.15 mmol) and 3-thiophene-boronic acid (0.028 g, 0.22 mmol) in a mixture of dioxane and H2O (5 ml:1 ml), Pd(PPh3)4 (0.03 g) was added at 80° C., followed by the NaHCO3 solution (0.065 g in 1 ml H2O) and this was stirred for 2 h. The solvent was distilled off and the residue was diluted to 20 ml with EtOAc, washed with H2O, dried over MgSO4 and filtered. The filtrate was evaporated and the residue was purified by FCC (SiO2, hexane/EtOAc), to give the title compound (0.065 g, 71%), as pale paste. 1H-NMR (CDCl3) 8.45 (d, 1H, J=1.53 Hz); 8.25-8.22 (m, 2H); 7.94 (dd, 1H, J=8.7, 1.8 Hz); 7.55-7.42 (m, 3H); 7.38-7.37 (m, 2H); 6.78 (s, 1H); 5.43 (bs, 1H); 4.29-4.13 (m, 4H); 1.46 (s, 9H); 1.27 (b, 6H).

Workup

  1. additionwas added at 80° C.
  2. distillationThe solvent was distilled off
  3. additionthe residue was diluted to 20 ml with EtOAc
  4. washwashed with H2O
  5. dry with materialdried over MgSO4
  6. filtrationfiltered
  7. customThe filtrate was evaporated
  8. customthe residue was purified by FCC (SiO2, hexane/EtOAc)

Sources & evidence

ORD record
ord-344ab597c5cb42439cdfc023ff634416
Source dataset
uspto-grants-2015_11
Patent number
US09193716B2

Reaction notes

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