2,2,2-Trifluoroethanol → HCID 57786298, Verbindung

To a solution of 1-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propan-1-ol (100 mg, 0.243 mmol) and 1,1′-(azodicarbonyl)dipiperdine (123 mg, 0.49 mmol) in tetrahydrofuran (5.0 mL) was added tri(n-butyl)phosphine (0.122 mL, 0.49 mmol) at room temperature. After the mixture was stirred at room temperature for 10 min under nitrogen atmosphere, 2,2,2-trifluoroethanol (0.177 mL, 2.32 mmol) was added to the reaction mixture. The mixture was stirred at 60° C. for 8 hr under nitrogen atmosphere. The mixture was concentrated in vacuo and diethyl ether was added to the residue. The solid was removed by filtration and the filtrate was concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 10-40% ethyl acetate/n-hexane gradient mixture and recrystallization from 2-propanol/n-hexane to give the title compound (41.8 mg, 0.085 mmol, 35%) as colorless crystals.

1. stirringThe mixture was stirred at 60° C. for 8 hr under nitrogen atmosphere
2. concentrationThe mixture was concentrated in vacuo and diethyl ether
3. additionwas added to the residue
4. customThe solid was removed by filtration
5. concentrationthe filtrate was concentrated in vacuo
6. customThe residue was purified by flash chromatography on silica gel eluting with a 10-40% ethyl acetate/n-hexane gradient mixture and recrystallization from 2-propanol/n-hexane

ORD-Eintrag

ord-4ecc38bacdf242d7b5c5c4ac289bc522

Quelldatensatz

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08785460B2