Triethylamine → Tert-butyl 6-(trifluoromethylsulfonyloxy)-3,4-dihydroisoquinoline-2(1H)-carboxylate

HRID 471839Notes

Reaction equation

HRID 471839 reaction equation
[OH:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH2:8][N:7]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH2:6][CH2:5]2.CCN(CC)CC.[O:26](S(C(F)(F)F)(=O)=O)[S:27]([C:30]([F:33])([F:32])[F:31])(=O)=[O:28]>C(Cl)Cl>[F:31][C:30]([F:33])([F:32])[S:27]([O:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH2:8][N:7]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH2:6][CH2:5]2)(=[O:28])=[O:26]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 67749Trifluoromethanesulfonic anhydrideHCID 10060623tert-Butyl 6-hydroxy-3,4-dihydroisoquinoline-2(1H)-carboxylate

Product 1

HCID 10091216Tert-butyl 6-(trifluoromethylsulfonyloxy)-3,4-dihydroisoquinoline-2(1H)-carboxylate

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a solution of 1,1-dimethylethyl 6-hydroxy-3,4-dihydro-2(1H)-isoquinolinecarboxylate (0.146 g; 0.586 mmol) and Et3N (0.17 mL; 1.2 mmol) in CH2Cl2 (5 mL) at 0° C. was added Tf2O (0.11 mL; 0.67 mmol (dropwise over 2 min. The mixture was stirred overnight, gradually warming to room temperature, diluted with CH2Cl2, washed (water, brine), dried over Na2SO4 and concentrated in vacuo. The residue was purified by flash chromatography (EtOAc/hexanes), affording the title compound as a colorless gum which slowly solidified. 1H NMR (400 MHz, CDCl3) δ 1.49 (s, 9H), 2.87 (t, J=5.7 Hz, 2H), 3.66 (br. t, J=5.5 Hz, 2H), 4.59 (s, 2H), 7.04-7.12 (m, 2H), 7.18 (d, J=8.4 Hz, 1H).

Workup

  1. washwashed (water, brine)
  2. dry with materialdried over Na2SO4
  3. concentrationconcentrated in vacuo
  4. customThe residue was purified by flash chromatography (EtOAc/hexanes)

Sources & evidence

ORD record
ord-343885ba5f7b4077aa6c982c9425c933
Source dataset
uspto-grants-2014_01
Patent number
US08633175B2

Reaction notes

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