تفاعل #5330

معادلة التفاعل

hydroxylamine hydrochloride

triethylamine

tetrahydrofuran

compound

Methyl 1-[(2'-cyanobiphenyl-4-yl)methyl]2-propylthiobenzimidazole-7-carboxylate

→

title compound

المردود 76.0%

Methyl 1-[(2'-(hydroxycarbamimidoyl)biphenyl-4-yl)methyl]-2-propylthiobenzimidazole-7-carboxylate

المردود 76.0%

المذيبات

DMSO

ظروف التفاعل

المعالجة

1. 1
   workup.STIRRINGthe mixture was stirred for 60 hours at 70° C
2. 2
   أخرىAfter removal of crystalline precipitate
3. 3
   ترشيحby filtration
4. 4
   تركيزthe filtrate was concentrated to dryness
5. 5
   أخرىThe residue was partitioned between water (1.2 liter) and ethyl acetate (350 ml)
6. 6
   غسيلthe upper layer was washed with water (70 ml×3)
7. 7
   أخرىEthyl acetate was evaporated under reduced pressure
8. 8
   workup.ADDITIONto the residue was added methanol (70 ml)
9. 9
   ترشيحResulting crystalline precipitate was filtered off
10. 10
    تركيزThe filtrate was concentrated to dryness under reduced pressure

الإجراء التجريبي

To a solution of hydroxylamine hydrochloride (20.85 g) in DMSO (200 ml) was added triethylamine (3.9 g) and the mixture was stirred for 30 minutes at room temperatures. To the reaction mixture was added the compound (16 g) obtained in Example (34c), and the mixture was stirred for 60 hours at 70° C. To the resultant mixture was added tetrahydrofuran (100 ml). After removal of crystalline precipitate by filtration, the filtrate was concentrated to dryness. The residue was partitioned between water (1.2 liter) and ethyl acetate (350 ml), and the upper layer was washed with water (70 ml×3). Ethyl acetate was evaporated under reduced pressure, and to the residue was added methanol (70 ml). Resulting crystalline precipitate was filtered off. The filtrate was concentrated to dryness under reduced pressure to give the title compound as a pale yellow syrup (13.0 g, 76%).

المصدر