Methanol → Ethyl 2-(3-aminoazetidin-1-yl)-1,3-benzothiazole-7-carboxylate

A 4 N hydrochloric acid/ethyl acetate solution (2.66 mL, 10.7 mmol) and methanol (5 mL) were added to a solution of ethyl 2-{3-[(tert-butoxycarbonyl)amino]azetidin-1-yl)-1,3-benzothiazole-7-carboxylate obtained in Example (224a) (402 mg, 1.07 mmol) in 1,4-dioxane (11 mL) at room temperature, followed by stirring for 17 hours. Then, THF (5 mL) was added, and the mixture was further stirred for 31 hours. The reaction solution was concentrated, and saturated aqueous sodium bicarbonate solution was added to the resulting residue. Thereafter, the mixture was extracted with ethyl acetate, and the combined organic layers were dried over anhydrous magnesium sulfate. Following filtration, the solvent was evaporated under reduced pressure to obtain 281 mg of the title compound as a pale yellow solid (95%).

1. stirringthe mixture was further stirred for 31 hours
2. concentrationThe reaction solution was concentrated
3. additionsaturated aqueous sodium bicarbonate solution was added to the resulting residue
4. extractionThereafter, the mixture was extracted with ethyl acetate
5. dry with materialthe combined organic layers were dried over anhydrous magnesium sulfate
6. filtrationfiltration
7. customthe solvent was evaporated under reduced pressure

ORD-Eintrag

ord-167f690727ec4b298474431516bb5fe4

Quelldatensatz

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08536197B2