Trifluoroacetic acid → 6-[2-(Phenylsulfonyl)ethyl]-1,2,3,4,5,6-hexahydroazepino[4,5-b]indole

HRID 1370391Notes

Reaction equation

HRID 1370391 reaction equation
[C:1]1([S:7]([CH2:10][CH2:11][N:12]2[C:20]3[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=3[C:14]3[CH2:21][CH2:22][N:23](C(OC(C)(C)C)=O)[CH2:24][CH2:25][C:13]2=3)(=[O:9])=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.FC(F)(F)C(O)=O>C(Cl)Cl>[C:1]1([S:7]([CH2:10][CH2:11][N:12]2[C:20]3[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=3[C:14]3[CH2:21][CH2:22][NH:23][CH2:24][CH2:25][C:13]2=3)(=[O:9])=[O:8])[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 22396854tert-Butyl 6-[2-(phenylsulfonyl)ethyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate

Product 1

HCID 223969156-[2-(Phenylsulfonyl)ethyl]-1,2,3,4,5,6-hexahydroazepino[4,5-b]indoleYield 11.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

tert-Butyl 6-[2-(phenylsulfonyl)ethyl]-1,4,5,6-tetrahydroazepino[4,5-b]indole-3(2H)-carboxylate (0.139 g, 0.306 mmol) was treated with trifluoroacetic acid (1 mL) for 5 min. CH2Cl2 was added and the reaction mixture was concentrated to dryness. The salt was partitioned between CH2Cl2 and a mixture of 1M KOH and brine. The organic layer was dried over MgSO4, filtered and concentrated. The crude product was chromatographed (SiO2, eluted with 1:1 EtOAc:hexane) to give 6-[2-(phenylsulfonyl)ethyl]-1,2,3,4,5,6-hexahydroazepino[4,5-b]indole (0.0123 g) as a white solid. 1H NMR (300 MHz, CD3OD) δ 3.13, 3.29-3.33, 3.42, 3.50, 3.71, 4.65, 7.07, 7.14, 7.22, 7.42, 7.51, 7.66, 7.70.

Workup

  1. concentrationthe reaction mixture was concentrated to dryness
  2. customThe salt was partitioned between CH2Cl2
  3. additiona mixture of 1M KOH and brine
  4. dry with materialThe organic layer was dried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude product was chromatographed
  8. wash(SiO2, eluted with 1:1 EtOAc:hexane)

Sources & evidence

ORD record
ord-766d492f4acd4b5596bd6aa5cfcb7de8
Source dataset
uspto-grants-2003_06
Patent number
US06583135B2

Reaction notes

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