Diisopropylethylamine → Tert-butyl 4-(4-(1-(benzyloxycarbonyl)azetidine-3-carboxamido)phenoxy)piperidine-1-carboxylate

1-(Benzyloxycarbonyl)azetidine-3-carboxylic acid (5.10 g, 21.67 mmol), 1-hydroxybenzotriazole hydrate (4.15 g, 27.1 mmol) and tert-butyl 4-(4-aminophenoxy)piperidine-1-carboxylate (5.28 g, 18.06 mmol) were suspended in dimethylformamide (25 ml) followed by addition of diisopropylethylamine (9.64 ml, 54.2 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (5.19 g, 27.1 mmol). The mixture was stirred at room temperature overnight and the solution was diluted with water. The resulting turbid mixture was extracted with ethyl acetate and then ethyl acetate/tetrahydrofuran. The organics were combined and dried over magnesium sulfate, filtered and concentrated to give a solid which was triturated with ether and filtered to give the title compound.

1. extractionThe resulting turbid mixture was extracted with ethyl acetate
2. dry with materialdried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated
5. customto give a solid which
6. customwas triturated with ether
7. filtrationfiltered

ORD-Eintrag

ord-3dcd7e33004249a4a81e5060ad578230

Quelldatensatz

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08975398B2