Diisopropylethylamine → (+)-2-bromo-N-(7-[1,4]dioxan-2-yl-4-methoxy-benzothiazol-2-yl)-isonicotinamide

HRID 985805Notes

Reaction equation

HRID 985805 reaction equation
[Br:1][C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][N:10]=1)[C:5]([OH:7])=O.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.C(N(C(C)C)C(C)C)C.[O:44]1[CH2:49][CH2:48][O:47][CH2:46][CH:45]1[C:50]1[C:58]2[S:57][C:56]([NH2:59])=[N:55][C:54]=2[C:53]([O:60][CH3:61])=[CH:52][CH:51]=1.C(=O)(O)[O-].[Na+]>C1COCC1>[Br:1][C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][N:10]=1)[C:5]([NH:59][C:56]1[S:57][C:58]2[C:50]([CH:45]3[CH2:46][O:47][CH2:48][CH2:49][O:44]3)=[CH:51][CH:52]=[C:53]([O:60][CH3:61])[C:54]=2[N:55]=1)=[O:7]

Participants

7

Reactant 5

HCID 81531DiisopropylethylamineHCID 2227012-Bromoisonicotinic acidHCID 516892Sodium BicarbonateHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 22507697(+)-7-[1,4)Dioxan-2-yl-4-methoxy-benzothiazol-2-ylamine

Product 1

HCID 22507693(+)-2-bromo-N-(7-[1,4]dioxan-2-yl-4-methoxy-benzothiazol-2-yl)-isonicotinamideYield 99.9%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of 789 mg (3.91 mmol) 2-bromo-isonicotinic acid in 50 ml THF were added 1.71 g (4.51 mmol) HATU and 1.29 ml (7.51 mmol) N-ethyldiisopropylamine and stirring continued at room temperature for 2 h. 800 mg (3.00 mmol) (+)-7-[1,4]dioxan-2-yl-4-methoxy-benzothiazol-2-ylamine was then added and stirring continued at room temperature for 24 h. The reaction mixture was then poured into saturated aqueous sodium bicarbonate solution and extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulfate and concentrated in vacuo. Flash chromatography (acetone) followed by trituration in ether afforded 1.35 g (99%) (+)-2-bromo-N-(7-[1,4]dioxan-2-yl-4-methoxy-benzothiazol-2-yl)-isonicotinamide as a light yelllow solid. [α]D20=+12.9° (c=0.76, CHCl3), ES-MS m/e (%):452 (M{81Br}+H+, 95), 450 (M{79Br}+H+, 100).

Workup

  1. stirringstirring
  2. waitcontinued at room temperature for 24 h
  3. extractionextracted three times with ethyl acetate
  4. dry with materialThe combined organic phases were dried over sodium sulfate
  5. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-8c25b0efdc1d4655b9856ba5cc52a074
Source dataset
uspto-grants-2005_03
Patent number
US06872833B2

Reaction notes

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