1,4-Dioxane → 1-(Cyclopropylmethyl)-3-methyl-5-(3-methylpyridin-2-yl)-1,3-dihydro-2,1,3-benzothiadiazole 2,2-dioxide

HRID 515215Notes

Reaction equation

HRID 515215 reaction equation
Br[C:2]1[CH:17]=[CH:16][C:5]2[N:6]([CH2:12][CH:13]3[CH2:15][CH2:14]3)[S:7](=[O:11])(=[O:10])[N:8]([CH3:9])[C:4]=2[CH:3]=1.[CH3:18][C:19]1[C:20]([Sn](CCCC)(CCCC)CCCC)=[N:21][CH:22]=[CH:23][CH:24]=1.O1CCOCC1>CO.C(P(C(C)(C)C)C(C)(C)C)(C)(C)C.C(P(C(C)(C)C)C(C)(C)C)(C)(C)C.[Pd]>[CH:13]1([CH2:12][N:6]2[C:5]3[CH:16]=[CH:17][C:2]([C:20]4[C:19]([CH3:18])=[CH:24][CH:23]=[CH:22][N:21]=4)=[CH:3][C:4]=3[N:8]([CH3:9])[S:7]2(=[O:11])=[O:10])[CH2:15][CH2:14]1

Participants

6

Reactant 3

HCID 312751,4-DioxaneHCID 164270983-Methyl-2-(tributylstannyl)pyridineHCID 674107445-Bromo-1-(cyclopropylmethyl)-3-methyl-1,3-dihydro-2,1,3-benzothiadiazole 2,2-dioxide

Product 1

HCID 533806431-(Cyclopropylmethyl)-3-methyl-5-(3-methylpyridin-2-yl)-1,3-dihydro-2,1,3-benzothiadiazole 2,2-dioxide

Reagents, catalysts & solvents 2

HCID 2734558Bis(tri-tert-butylphosphine)palladium(0)CatalystHCID 887MethanolSolvent

Conditions

Temperature
100 °C

Procedure

To a microwave vial was added 5-bromo-1-(cyclopropylmethyl)-3-methyl-1,3-dihydro-2,1,3-benzothiadiazole 2,2-dioxide (1-4) (0.043 g, 0.14 mmol), palladium bis(tri-tert-butylphosphine) (0.014 g, 0.027 mmol), 3-methyl-2-(tributylstannyl)pyridine (0.078 g, 0.20 mmol) and finally dioxane (1 mL). The reaction mixture was then heated under microwave irradiation at 100° C. for 10 minutes. The crude reaction mixture was then allowed to cool to room temperature, diluted with methanol, then filtered and concentrated. Purification of crude reaction mixture by reverse phase chromatography (Waters Sunfire MSC18, 10% acetonitrile/0.1% trifluoroacetic acid/water→100% acetonitrile/0.1% trifluoroacetic acid/water) to give 1-(cyclopropylmethyl)-3-methyl-5-(3-methylpyridin-2-yl)-1,3-dihydro-2,1,3-benzothiadiazole 2,2-dioxide (3-1) as a tan solid. HRMS (M+H)+: observed=330.1270, calculated=330.1271.

Workup

  1. customThe crude reaction mixture
  2. temperatureto cool to room temperature
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customPurification of crude
  6. customreaction mixture by reverse phase chromatography (Waters Sunfire MSC18, 10% acetonitrile/0.1% trifluoroacetic acid/water→100% acetonitrile/0.1% trifluoroacetic acid/water)

Sources & evidence

ORD record
ord-fcd6f858cf334853be57089d24f012cd
Source dataset
uspto-grants-2015_08
Patent number
US09108937B2

Reaction notes

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