3-Isopropylbenzeneboronic acid → 6-(3-isopropylphenyl)-2'-methyl-2-(tetrahydro-2H-pyran-3-yl)-2'H-spiro[chroman-4,5'-[1,2,4]oxadiazol]-3'-amine

HRID 1408705Notes

Reaction equation

HRID 1408705 reaction equation
Br[C:2]1[CH:3]=[C:4]2[C:11]3([O:15][N:14]([CH3:16])[C:13]([NH2:17])=[N:12]3)[CH2:10][CH:9]([CH:18]3[CH2:23][CH2:22][CH2:21][O:20][CH2:19]3)[O:8][C:5]2=[CH:6][CH:7]=1.[CH:24]([C:27]1[CH:28]=[C:29](B(O)O)[CH:30]=[CH:31][CH:32]=1)([CH3:26])[CH3:25]>O1CCOCC1.C([O-])([O-])=O.[Cs+].[Cs+].Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH:24]([C:27]1[CH:32]=[C:31]([C:2]2[CH:3]=[C:4]3[C:11]4([O:15][N:14]([CH3:16])[C:13]([NH2:17])=[N:12]4)[CH2:10][CH:9]([CH:18]4[CH2:23][CH2:22][CH2:21][O:20][CH2:19]4)[O:8][C:5]3=[CH:6][CH:7]=2)[CH:30]=[CH:29][CH:28]=1)([CH3:26])[CH3:25]

Participants

6

Reactant 2

HCID 27734783-Isopropylbenzeneboronic acidHCID 584238486-bromo-2'-methyl-2-(tetrahydro-2H-pyran-3-yl)-2'H-spiro[chroman-4,5'-[1,2,4]oxadiazol]-3'-amine

Product 1

HCID 584241646-(3-isopropylphenyl)-2'-methyl-2-(tetrahydro-2H-pyran-3-yl)-2'H-spiro[chroman-4,5'-[1,2,4]oxadiazol]-3'-amineYield 18%

Reagents, catalysts & solvents 3

HCID 178418476HCID 178418476, compoundCatalystHCID 10796Cesium carbonateSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
120 °C

Procedure

Pd(PPh3)2Cl2 (5 mg) in a 10 mL flask under Ar was treated sequentially with the 6-bromo-2′-methyl-2-(tetrahydro-2H-pyran-3-yl)-2′H-spiro[chroman-4,5′-[1,2,4]oxadiazol]-3′-amine (40 mg, 0.105 mmol) in 1,4-dioxane (1 mL), Cs2CO3 (2 N, 0.2 mL) and 3-isopropylphenylboronic acid (25.8 mg, 144 mmol). The mixture was heated at 120° C. under Ar in a microwave reactor for 30 minutes. The reaction mixture was concentrated in vacuo to give the residue, which was purified by preparative TLC and preparative HPLC to give 6-(3-isopropylphenyl)-2′-methyl-2-(tetrahydro-2H-pyran-3-yl)-2′H-spiro[chroman-4,5′-[1,2,4]oxadiazol]-3′-amine (7.5 mg, 18%). 1H NMR (MeOD): 1.31 (d, 6H), 1.68 (m, 2H), 1.92-2.07 (m, 3H), 2.43-2.72 (m, 1H), 2.96 (m, 1H), 3.34 (s, 3H), 3.45-3.58 (m, 2H), 3.83-4.01 (m, 2H), 4.12-4.23 (m, 2H), 6.98 (m, 1H), 7.21 (m, 1H), 7.38 (m, 3H), 7.63 (m, 1H), 7.79 (m, 1H).

Workup

  1. concentrationThe reaction mixture was concentrated in vacuo
  2. customto give the residue, which
  3. customwas purified by preparative TLC and preparative HPLC

Sources & evidence

ORD record
ord-cb9d48f6a0e0454d9b1ce64f1e89e765
Source dataset
uspto-grants-2014_12
Patent number
US08921359B2

Reaction notes

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