Sulfuric Acid → 2-[4-(6-Chloro-benzo[b]thiophene-2-sulfonyl)-2-oxo-piperazin-1-ylmethyl]-5,6,7,8-tetrahydro-thiazolo[4,5-c]azepin-4-one

HRID 1433076Notes

Reaction equation

HRID 1433076 reaction equation
[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[CH:9]=[C:8]([S:10]([N:13]3[CH2:18][CH2:17][N:16]([CH2:19][C:20]4[S:21][C:22]5[CH2:28][CH2:27][CH2:26][C:25](=[O:29])[C:23]=5[N:24]=4)[C:15](=[O:30])[CH2:14]3)(=[O:12])=[O:11])[S:7][C:6]=2[CH:31]=1.S(=O)(=O)(O)O.[N-:37]=[N+]=[N-].[Na+].C([O-])([O-])=O.[K+].[K+]>C(Cl)(Cl)Cl.C(Cl)Cl>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[CH:9]=[C:8]([S:10]([N:13]3[CH2:18][CH2:17][N:16]([CH2:19][C:20]4[S:21][C:22]5[CH2:28][CH2:27][CH2:26][NH:37][C:25](=[O:29])[C:23]=5[N:24]=4)[C:15](=[O:30])[CH2:14]3)(=[O:11])=[O:12])[S:7][C:6]=2[CH:31]=1

Participants

7

Reactant 4

HCID 1118Sulfuric AcidHCID 11430Potassium CarbonateHCID 33557Sodium AzideHCID 670150242-[4-(6-chloro-benzo[b]thiophene-2-sulfonyl)-2-oxo-piperazin-1-ylmethyl]-6,7-dihydro-5H-benzothiazol-4-one

Product 1

HCID 670148362-[4-(6-Chloro-benzo[b]thiophene-2-sulfonyl)-2-oxo-piperazin-1-ylmethyl]-5,6,7,8-tetrahydro-thiazolo[4,5-c]azepin-4-one

Reagents, catalysts & solvents 2

HCID 6212ChloroformSolventHCID 6344DichloromethaneSolvent

Procedure

2-[4-(6-Chloro-benzo[b]thiophene-2-sulfonyl)-2-oxo-piperazin-1-ylmethyl]-6,7-dihydro-5H-benzothiazol-4-one (60 mg, 0.12 mmol) is dissolved in CHCl3 (4 mL) and sulfuric acid (0.5 mL) is added with vigorous stirring. Sodium azide (25 mg 0.4 mmol) is added and the reaction is stirred 1¾ h. The reaction is then added dropwise to a rapidly stirring mixture of K2CO3/H20/CH2Cl2. The organic phase is separated and washed with water, dried (MgSO4) and concentrated. The residue is purified by column chromatography (silica, 2% to 6% MeOH/CH2Cl2) to provide a mixture of two products.

Workup

  1. additionThe reaction is then added dropwise to
  2. stirringa rapidly stirring
  3. customThe organic phase is separated
  4. washwashed with water
  5. dry with materialdried (MgSO4)
  6. concentrationconcentrated
  7. customThe residue is purified by column chromatography (silica, 2% to 6% MeOH/CH2Cl2)
  8. customto provide
  9. additiona mixture of two products

Sources & evidence

ORD record
ord-1f6e5c5f31934847adb4f29d1e8ce267
Source dataset
uspto-grants-2009_11
Patent number
US07612075B2

Reaction notes

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