Tetrabutylammonium Fluoride → 1-[2-(4,5-Diphenyloxazol-2-yl)ethylamino]-1,2,3,4-tetrahydro-5-hydroxynaphthalene

HRID 1741407Notes

Reaction equation

HRID 1741407 reaction equation
[C:1]1([C:7]2[N:8]=[C:9]([CH2:18][CH2:19][NH:20][CH:21]3[C:30]4[C:25](=[C:26]([O:31][Si](C(C)(C)C)(C5C=CC=CC=5)C5C=CC=CC=5)[CH:27]=[CH:28][CH:29]=4)[CH2:24][CH2:23][CH2:22]3)[O:10][C:11]=2[C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>C1COCC1>[C:1]1([C:7]2[N:8]=[C:9]([CH2:18][CH2:19][NH:20][CH:21]3[C:30]4[C:25](=[C:26]([OH:31])[CH:27]=[CH:28][CH:29]=4)[CH2:24][CH2:23][CH2:22]3)[O:10][C:11]=2[C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 183674001-[2-(4,5-Diphenyloxazol-2-yl)ethylamino]-1,2,3,4-tetrahydro-5-(t-butyldiphenylsilyloxy)naphthalene

Product 1

HCID 183672931-[2-(4,5-Diphenyloxazol-2-yl)ethylamino]-1,2,3,4-tetrahydro-5-hydroxynaphthaleneYield 37.9%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

A solution of 5-(t-butyldiphenylsilyloxy)-1-oxo-1,2,3,4-tetrahydronaphthalene (0.52 g), 2-(4,5-diphenyloxazol-2-yl)ethylamine (0.33 g) and p-toluenesulfonic acid (catalytic amount) in toluene (30 ml) was refluxed for 15 hours with Dean-stark equipment. The solution was evaporated in vacuo and MeOH (10 ml) was added to the residue. To the MeOH solution, NaBH4 (0.21 g) was added at 0° C. After being stirred for 30 minutes at room temperature, the solution was evaporated in vacuo. The residue was partitioned between ethyl acetate and water. The organic layer was washed with brine. The dried solvent was evaporated in vacuo, and the residue was purified by chromatography on silica gel to give 1-[2-(4,5-diphenyloxazol-2-yl)ethylamino]-1,2,3,4-tetrahydro-5-(t-butyldiphenylsilyloxy)naphthalene (0.25 g) and 1-[2-(4,5-diphenyloxazol-2-yl)ethylamino]-1,2,3,4-tetrahydro-5-hydroxynaphthalene (0.11 g). To a solution of 1-[2-(4,5-diphenyloxazol-2-yl)ethylamino]-1,2,3,4-tetrahydro-5-(t-butyldiphenylsilyloxy)naphthalene (0.25 g) in THF (2 ml) was added 1M-THF solution (2 ml) of tetra-n-butyl ammonium fluoride (TBAF). After being stirred for 1 hour at room temperature, the reaction mixture was partitioned between ethyl acetate and sat. NaHCO3. The organic layer was washed with brine. The dried solvent was evaporated in vacuo. The residue was purified by chromatography on silica gel to give 1-[2-(4,5-diphenyloxazol-2-yl) ethylamino]-1,2,3,4-tetrahydro-5-hydroxynaphthalene (0.06 g). MS (m/z): 411 (M+ +1) NMR (CDCl3, δ): 1.65-2.10 (4H, m), 2.38-2.85 (2H, m), 3.12 (2H, t, J=5.9 Hz), 3.22 (2H, t, J=5.9 Hz), 6.60-6.79 (1H, m), 6.89-7.12 (2H, m), 7.20-7.42 (6H, m), 7.52-7.75 (4H, m)

Workup

  1. customthe reaction mixture was partitioned between ethyl acetate and sat. NaHCO3
  2. washThe organic layer was washed with brine
  3. customThe dried solvent was evaporated in vacuo
  4. customThe residue was purified by chromatography on silica gel

Sources & evidence

ORD record
ord-a702e37d0eb94996a56a67cbf69d17cd
Source dataset
uspto-grants-1999_10
Patent number
US05972965

Reaction notes

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