Sodium hydrosulfide → Tert-butyl (6-(3-isopropylisothiazol-5-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methylcarbamate

HRID 219215

Reaction equation

HRID 219215 reaction equation
[CH3:1][CH:2]([CH3:25])[C:3](=O)[C:4]#[C:5][C:6]1[CH:7]=[CH:8][C:9]2[N:10]([C:12]([CH2:15][NH:16][C:17](=[O:23])[O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[N:13][N:14]=2)[N:11]=1.[NH2:26]OS(O)(=O)=O.C(=O)(O)[O-].[Na+].[SH-:37].[Na+]>O.O1CCOCC1>[CH:2]([C:3]1[CH:4]=[C:5]([C:6]2[CH:7]=[CH:8][C:9]3[N:10]([C:12]([CH2:15][NH:16][C:17](=[O:23])[O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[N:13][N:14]=3)[N:11]=2)[S:37][N:26]=1)([CH3:25])[CH3:1]

Participants

7

Reactant 4

HCID 28015Sodium hydrosulfideHCID 76284hydroxylamine-O-sulfonic acidHCID 516892Sodium BicarbonateHCID 57691360Tert-butyl (6-(4-methyl-3-oxopent-1-ynyl)-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methylcarbamate

Product 1

HCID 57691285Tert-butyl (6-(3-isopropylisothiazol-5-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methylcarbamateYield 22.5%

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 312751,4-DioxaneSolvent

Conditions

Temperature
0 °C

Procedure

An aqueous mixture of tert-butyl (6-(4-methyl-3-oxopent-1-ynyl)-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methylcarbamate (0.800 g, 2.33 mmol) and hydroxylamine-O-sulfonic acid (0.263 g, 2.33 mol) in water (8.0 mL) and 1,4-dioxane (8.0 mL) was stirred at 0° C. until complete consumption of the organic starting material was observed. The mixture was then carefully treated with solid sodium bicarbonate (0.196 g, 2.33 mmol), followed by treatment with 1.4 M aqueous sodium hydrosulfide (1.83 ml, 2.56 mmol). The reaction was stirred at room temperature overnight. The reaction mixture was diluted with water (20 mL) and extracted with DCM (40 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The concentrated crude material was dissolved in minimal DCM and was purified via MPLC (eluting with 0-10% MeOH/NH4OH in DCM) to yield tert-butyl (6-(3-isopropylisothiazol-5-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)methylcarbamate (0.196 g, 22.5% yield) with 82% purity. MS (ESI pos. ion) m/z: 433.0 (M+H). Calc'd Exact Mass for C21H20N8OS: 432.51.

Workup

  1. stirringThe reaction was stirred at room temperature overnight
  2. extractionextracted with DCM (40 mL)
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. concentrationThe concentrated crude material
  7. dissolutionwas dissolved in minimal DCM
  8. customwas purified via MPLC (eluting with 0-10% MeOH/NH4OH in DCM)

Sources & evidence

ORD record
ord-979217b073eb4105a405364844328837
Source dataset
uspto-grants-2012_06
Patent number
US08198448B2

Linked notes

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