Реакция #59857

Уравнение реакции

2-(((3-methyl-4-(2-(2-propyl-1,3-dioxolan-2-yl)ethoxy)pyridin-2-yl)methyl)thio)-1H-benzimidazole

3-chloroperbenzoic acid

sodium hydrogen carbonate

ethyl acetate

→

title compound

Выход 64.3%

2-(((3-methyl-4-(2-(2-propyl-1,3-dioxolan-2-yl)ethoxy)pyridin-2-yl) methyl)sulfinyl)-1H-benzimidazole

Выход 64.3%

Растворители

methanol

toluene

methanol

Условия реакции

Обработка

1. 1
   ТемператураThe mixture was cooled in a nitrogen atmosphere
2. 2
   workup.ADDITIONwas added at an inner temperature of below −70° C.
3. 3
   ДругоеThe organic layer was separated
4. 4
   Промывкаwashed with a saturated saline solution
5. 5
   Сушкаdried over anhydrous sodium sulfate
6. 6
   Фильтрацияfiltered
7. 7
   КонцентрированиеThe filtrate was concentrated under reduced pressure
8. 8
   workup.DISSOLUTIONThe residue was dissolved in methylene chloride

Методика

The 2-(((3-methyl-4-(2-(2-propyl-1,3-dioxolan-2-yl)ethoxy)pyridin-2-yl)methyl)thio)-1H-benzimidazole (482 mg, 1.17 mmol) obtained in the step (3f) was dissolved in a solvent mixture of toluene (30 ml) and methanol (3 ml). The mixture was cooled in a nitrogen atmosphere. To this mixture, a methanol solution (1.3 ml) of 3-chloroperbenzoic acid (311 mg, 1.17 mmol as the content was regarded as 65%) was added at an inner temperature of below −70° C. and stirred below −60° C. for 2 hours. To the reaction mixture, an aqueous solution of sodium hydrogen carbonate and ethyl acetate were added. The organic layer was separated and washed with a saturated saline solution, dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated under reduced pressure. The residue was dissolved in methylene chloride and subjected to silica gel column chromatography using NH silica gel (elution solvent: methylene chloride/methanol=1/0→100/1→100/5) to obtain the title compound (323 mg, yield: 64.3%).

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