Trifluoromethanesulfonic acid → 2,3-dihydrospiro[furo[2,3-g][1,4]-benzodioxine-8,8'-[1,3]thiazolo[5,4-e]indol]-7'(6'H)-one

HRID 1965499Notes

Reaction equation

HRID 1965499 reaction equation
COC1C=CC(C[N:8]2[C:16]3[C:11](=[C:12]4[S:19][CH:18]=[N:17][C:13]4=[CH:14][CH:15]=3)[C:10]3([C:31]4[C:22](=[CH:23][C:24]5[O:29][CH2:28][CH2:27][O:26][C:25]=5[CH:30]=4)[O:21][CH2:20]3)[C:9]2=[O:32])=CC=1.FC(F)(F)S(O)(=O)=O>ClCCl.FC(F)(F)C(O)=O>[S:19]1[C:12]2=[C:11]3[C:16](=[CH:15][CH:14]=[C:13]2[N:17]=[CH:18]1)[NH:8][C:9](=[O:32])[C:10]13[C:31]2[C:22](=[CH:23][C:24]3[O:29][CH2:28][CH2:27][O:26][C:25]=3[CH:30]=2)[O:21][CH2:20]1

Participants

5

Reactant 2

HCID 62406Trifluoromethanesulfonic acidHCID 593523706'-(4-methoxybenzyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,8'-[1,3]thiazolo[5,4-e]indol]-7'(6'H)-one

Product 1

HCID 593523112,3-dihydrospiro[furo[2,3-g][1,4]-benzodioxine-8,8'-[1,3]thiazolo[5,4-e]indol]-7'(6'H)-oneYield 46.1%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 6422Trifluoroacetic acidSolvent

Procedure

To a solution of 6′-(4-methoxybenzyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,8′-[1,3]thiazolo[5,4-e]indol]-7′(6′H)-one (1.9 g, 4.0 mmol) in dichloromethane (40 mL) and trifluoroacetic acid (40 mL) was added at ambient temperature trifluoromethanesulfonic acid (1.8 mL, 20 mmol). The mixture was stirred at ambient temperature for 16 h and concentrated in vacuo Water was added to the residue and the mixture was extracted with ethyl acetate. The combined organic extracts were washed with saturated aqueous sodium bicarbonate and water, dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The residue was purified by column chromatography and eluted with 50% ethyl acetate in hexanes to afford 2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,8′-[1,3]thiazolo[5,4-e]indol]-7′(6′H)-one (0.65 g, 44%): 1H NMR (300 MHz, CDCl3) δ10.86 (s, 1H), 9.06 (s, 1H), 7.97 (d, J=8.5 Hz, 1H), 7.14 (d, J=8.5 Hz, 1H), 6.54 (s, 1H), 6.21 (s, 1H), 4.68 (s, 2H), 4.19-4.01 (m, 4H); MS (ES+) m/z 353.1 (M+1).

Workup

  1. concentrationconcentrated in vacuo Water
  2. additionwas added to the residue
  3. extractionthe mixture was extracted with ethyl acetate
  4. washThe combined organic extracts were washed with saturated aqueous sodium bicarbonate and water
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by column chromatography
  9. washeluted with 50% ethyl acetate in hexanes

Sources & evidence

ORD record
ord-3d877b9662324099a9d20d490e00e34b
Source dataset
uspto-grants-2013_04
Patent number
US08415370B2

Reaction notes

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