Boron tribromide → 3-[3-(6-Hydroxy-m-tolyl)-1,2-benzisothiazol-5-yl]-1-methyl-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione

HRID 1274549Notes

Reaction equation

HRID 1274549 reaction equation
C[O:2][C:3]1[C:8]([CH3:9])=[CH:7][C:6]([C:10]2[C:14]3[CH:15]=[C:16]([N:19]4[C:24](=[O:25])[CH:23]=[C:22]([C:26]([F:29])([F:28])[F:27])[N:21]([CH3:30])[C:20]4=[O:31])[CH:17]=[CH:18][C:13]=3[S:12][N:11]=2)=[CH:5][CH:4]=1.B(Br)(Br)Br>C(Cl)Cl>[OH:2][C:3]1[C:8]([CH3:9])=[CH:7][C:6]([C:10]2[C:14]3[CH:15]=[C:16]([N:19]4[C:24](=[O:25])[CH:23]=[C:22]([C:26]([F:29])([F:28])[F:27])[N:21]([CH3:30])[C:20]4=[O:31])[CH:17]=[CH:18][C:13]=3[S:12][N:11]=2)=[CH:5][CH:4]=1

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 700990583-[3-(6-Methoxy-m-tolyl)-1,2-benzisothiazol-5-yl]-1-methyl-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione

Product 1

HCID 1363337203-[3-(6-Hydroxy-m-tolyl)-1,2-benzisothiazol-5-yl]-1-methyl-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedioneYield 98.1%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A solution of 3-[3-(6-methoxy-m-tolyl)-1,2-benzisothiazol-5-yl]-1-methyl-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione (111 g, 0.248 mol) in methylene chloride is cooled to -5° C., treated over one hour with a 1 M solution of boron tribromide in methylene chloride (322 mL, 0.322 mol), stirred for one hour, washed sequentially with water and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo to give the title product as a yellow solid (105 g, 98.1%) which is identified by NMR spectral analyses.

Workup

  1. washwashed sequentially with water and brine
  2. dry with materialdried over anhydrous magnesium sulfate
  3. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-feac231dc6f44ceb9d01d9905e26d745
Source dataset
uspto-grants-2000_12
Patent number
US06156700

Reaction notes

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