Hydrochloric Acid → 5-Methyl-2,3,4,5-tetrahydro-1,4-benzothiazepine

To a solution of 5-methyl-2,3-dihydro-1,4-benzothiazepine (5.92 g, 33.40 mmol) in methanol (100 mL) was added a solution of sodium borohydride (3.16 g, 83.49 mmol) in water (60 mL). After being stirred at room temperature overnight, the reaction mixture was acidified with concentrated hydrochloric acid, and then stirred at room temperature for 30 minutes. After being adjusted to pH 9 with an aqueous solution of sodium hydroxide, the resulting mixture was extracted with ethyl acetate (60 mL×3). The combined organic layers were washed by brine (100 mL), dried over anhydrous sodium sulfate, and concentrated in vacuo to afford 5.6 g of 5-methyl-2,3,4,5-tetrahydro-1,4-benzothiazepine, MS obsd. (ESI+) [(M+H)+] 180.

1. stirringstirred at room temperature for 30 minutes
2. extractionthe resulting mixture was extracted with ethyl acetate (60 mL×3)
3. washThe combined organic layers were washed by brine (100 mL)
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo

ORD record

ord-3da58bb64faf42fbaaac30334a3f6c04

Source dataset

uspto-grants-2014_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08871756B2