Water → ethyl 8-chloro-6-iodo-2-(trifluoromethyl)-2H-chromene-3-carboxylate

HRID 854986

Reaktionsgleichung

[Cl:1][C:2]1[C:3]([OH:11])=[C:4]([CH:7]=[C:8]([I:10])[CH:9]=1)[CH:5]=O.[F:12][C:13]([F:22])([F:21])/[CH:14]=[CH:15]/[C:16]([O:18][CH2:19][CH3:20])=[O:17].C([O-])([O-])=O.[K+].[K+].O>CN(C=O)C>[Cl:1][C:2]1[CH:9]=[C:8]([I:10])[CH:7]=[C:4]2[C:3]=1[O:11][CH:14]([C:13]([F:12])([F:22])[F:21])[C:15]([C:16]([O:18][CH2:19][CH3:20])=[O:17])=[CH:5]2

Komponenten

Reaktionsbedingungen

Temperatur: 100 °C

Versuchsvorschrift

To 18 g (63.7 mmole) of 3-chloro-2-hydroxy-5-iodobenzaldehyde in 16 mL of DMF was added 14.3 mL (16.1 g, 95.6 mmole) of ethyl trifluorocrotonate and 9.69 g (70 mmole) of K2CO3. The mixture was heated to 100° C. for 2 h. The mixture was allowed to cool, treated with 300 mLs of H2O and extracted three times with Et2O. The combined extracts were washed with water and filtered through a silica plug (4.5×6 cm). The silica was washed with methylene chloride and combined filtrates concd to give 10.39 g of a yellow solid. Recystalization in hexanes gave 6.64 g (24.1%) of a crystalline, yellow solid: 1H NMR (CDCl3/400 MHz) 1.35 (t, 3H, J=7.1 Hz), 4.33 (m, 2H), 5.81 (q, 1H, J=6.6 Hz), 7.44 (d, 1H, J=2.0 Hz), 7.62 (s, 1H), 7.66 (d, 1H, J=2.0 Hz); 19F NMR (CDCl3/400 MHz) −79.0 (d, 3F, J=6.8 Hz); 13C NMR (CDCl3/100 MHz) 13.1, 60.8, 70.4 (q, J=33.7 Hz), 82.6 (C-I), 117.7, 121.2, 121.8, 121.9 (q, J=287.2 Hz), 133.6, 134.9, 139.9, 147.9, 162.0; MS (ESI+) 433 (M+1, 100); HRMS (EI) m/z calcd for (C13H9O3IClF3) 431.9237, found 431.9221.

Aufarbeitung

temperatureto cool
extractionextracted three times with Et2O
washThe combined extracts were washed with water
filtrationfiltered through a silica plug (4.5×6 cm)
washThe silica was washed with methylene chloride

Quellen und Nachweise

ORD-Eintrag: ord-7515aa07fcbd474293ebc7206b5cd9cd
Quelldatensatz: uspto-grants-2007_08
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US07259266B2

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