Water → HCID 135812616, compound

HRID 1450518Notes

Reaction equation

HRID 1450518 reaction equation
[CH:1]([C:4]1[CH:9]=[CH:8][C:7]([N:10]2[N:14]=[N:13][C:12]([C:15]3[CH:20]=[CH:19][C:18]([O:21]C)=[CH:17][CH:16]=3)=[N:11]2)=[CH:6][CH:5]=1)([CH3:3])[CH3:2].B(Br)(Br)Br.O>ClCCl>[CH:1]([C:4]1[CH:5]=[CH:6][C:7]([N:10]2[N:14]=[N:13][C:12]([C:15]3[CH:16]=[CH:17][C:18]([OH:21])=[CH:19][CH:20]=3)=[N:11]2)=[CH:8][CH:9]=1)([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 962WaterHCID 25134Boron tribromideHCID 19976993HCID 19976993, compound

Product 1

HCID 135812616HCID 135812616, compoundYield 88.8%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

4-Isopropylaniline (1.35 g) was added to a mixed solution of 50% ethanol (16 ml) and concentrated hydrochloric acid (2.6 ml). To the mixture was added a solution of sodium nitrite (0.69 g) in water (4 ml) over 10 min below 5° C. and stirring was continued for 10 min. To a solution of 4-methoxybenzaldehyde phenylsulfonylhydrazone (2.9 g) in pyridine (60 ml) was added dropwise the above solution of diazonium salt during 20 min at -10° C.~-15° C., and stirring was continued for 30 min at -10° C. and for 30 min at room temperature. The mixture was poured into ice water and extracted with ethyl acetate. The extract was washed succesively with 4 N hydrochloric acid, water, aqueous sodium carbonate,and water, dried, and evaporated to dryness. The residue was purified by column chromatography on silica gel with benzene-hexane (1/2-2/1) as an eluate to give 2-(4-isopropylphenyl)-5-(4-methoxyphenyl)tetrazole (1.6 g,54%). To a solution of 2-(4- isopropylphenyl)-5-(4-methoxyphenyl)tetrazole (1.3 g) in dichloromethane (10 ml) was added dropwise boron tribromide (10 ml,2.6M solution in dichloromethane) at -10° C. Stirring was continued for 1 h at -10° C. and for 1 h at room temperature. To the mixture was added water (20 ml), and the mixture was extracted with chloroform. The extract was washed with water, dried and evaporated to dryness. The residue was recrystallized from benzene to give 1.1 g (72%) of the title compound.

Workup

  1. extractionthe mixture was extracted with chloroform
  2. washThe extract was washed with water
  3. customdried
  4. customevaporated to dryness
  5. customThe residue was recrystallized from benzene

Sources & evidence

ORD record
ord-7ba09dead30945bd8604b9af4692caa2
Source dataset
uspto-grants-1997_02
Patent number
US05602161

Reaction notes

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