2,2,2-Trifluoroethanol → 2,2,2-Trifluoroethyl 5-(tetradecyloxy)furan-2-carboxylate

To a stirred, room temperature suspension of 5-(tetradecyloxy)furan-2-carboxylic acid (1.3 g, 4.0 mmol) in CH2Cl2 (40 mL) was added N,N′-dicyclohexylcarbodiimide (0.990 g, 4.8 mmol), N,N-dimethylaminopyridine (0.488 g, 4.0 mmol) and 2,2,2-trifluoroethanol (0.875 mL, 12.0 mmol). The flask was capped and stirring was continued for 16 hrs at which time TLC (10% EtOAc in Hexanes Rf=0.05 (SM) and 0.25 (Prod)) indicated complete consumption of the starting material. The resulting suspension was diluted with CH2Cl2 (40 mL), filtered and concentrated. This crude material was purified by flash chromatography eluting with 5-20% EtOAc in Hexanes. The resulting solid was further purified by recrystallization in 30 mL of hot 2-propanol with the addition of a minimum amount of water to yield 1.13 g (70%) of the title compound as white needles. MS (m/z, ES−): 406.0 (M−1, 100%); EA found for C23H36F3NO2: C, 62.20; H, 8.18; calcd: C, 62.05; H, 8.18; 1H NMR (400 MHz, DMSO-d6) δ: 7.4 (d, 1H), 5.7 (d, 1H), 4.9 (q, 2H), 4.2 (t, 2H), 1.50-1.57 (m, 2H), 1.10-1.20 (m, 22H), 0.85 (t, 3H).

1. customThe flask was capped
2. customconsumption of the starting material
3. additionThe resulting suspension was diluted with CH2Cl2 (40 mL)
4. filtrationfiltered
5. concentrationconcentrated
6. customThis crude material was purified by flash chromatography
7. washeluting with 5-20% EtOAc in Hexanes
8. customThe resulting solid was further purified by recrystallization in 30 mL of hot 2-propanol with the addition of a minimum amount of water

ORD-Eintrag

ord-cc023e50ba544f75b58ea0018d1d2e9d

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09434718B2