Tetrahydrofuran → 2-Methyl-N-(2,2,2-trifluoro-ethyl)-malonamic acid ethyl ester

To a solution of 1.56 g (10.6 mmol) methyl-malonic acid monoethyl ester in 20 ml of tetrahydrofuran 1.06 g (10.6 mmol) of 2,2,2-trifluoroethylamine, 2.05 g (10.6 mmol) of N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride, 1.44 g (10.6 mmol) of 1-hydroxybenzotrizole hydrate and 2.75 g (21.2 mmol) of N,N-diisopropyl-ethylamine were added. The mixture was stirred at room temperature for 18 h. The mixture was poured onto 0.5 N HCl (50 ml) and afterwards extracted with dichloromethane (three times 50 ml). The combined organic layers were extracted with 0.5 N aqueous NaHCO3 solution, dried (MgSO4) and evaporated on the rotary evaporator. The residue was purified by column filtration (hexane/ethyl acetate=2:1) to yield 1.48 g (61%) of the title compound as white crystalline solid.

1. extractionafterwards extracted with dichloromethane (three times 50 ml)
2. extractionThe combined organic layers were extracted with 0.5 N aqueous NaHCO3 solution
3. dry with materialdried (MgSO4)
4. customevaporated on the rotary evaporator
5. filtrationThe residue was purified by column filtration (hexane/ethyl acetate=2:1)

ORDレコード

ord-bbea5bcae35741a28bc490115381b2fa

出典データセット

uspto-grants-2007_01

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07160875B2