Reaktion #1769523

Reaktionsgleichung

HCl

difluoromethyl phenyl sulfone

4-chlorobenzaldehyde

sodium hydroxide

→

1-(4-chlorophenyl)-2,2-difluoro-2-phenylsulfonylethanol

Ausbeute 88.4%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   ExtraktionExtraction of the aqueous mixture with three 10 mL portions of ethyl acetate
2. 2
   Sonstigedrying
3. 3
   Einengen(MgSO4), and concentration in vacuo of the organic layers
4. 4
   Sonstigegave a residue which
5. 5
   Sonstigewas purified by preparative TLC (two 2 mm silica gel plates eluted with 10% ethyl acetate in toluene)

Vorschrift

A reaction mixture generated from 100 mg (0.52 mmol) of difluoromethyl phenyl sulfone, 225 mg (1.6 mmol) of 4-chlorobenzaldehyde, 1.5 mL of dichloromethane, 1 mL of 50% aqueous sodium hydroxide and 20 mg (0.050 mmol) of Aliquat 336 was poured into 20 mL of 1N HCl. Extraction of the aqueous mixture with three 10 mL portions of ethyl acetate followed by combination, drying (MgSO4), and concentration in vacuo of the organic layers gave a residue which was purified by preparative TLC (two 2 mm silica gel plates eluted with 10% ethyl acetate in toluene), affording 153 mg (88% yield) of 1-(4-chlorophenyl)-2,2-difluoro-2-phenylsulfonylethanol as a solid. Crystallization from toluene provided an analytical sample: mp; 100°-102° C.; IR (KBr) 3530, 3060, 2921, 1491, 1446, 1332, 1157, 1120, 1113, 1090, 1016, 1005, 784, 723, 683, 589, 538 cm-1 ; 1H NMR (CDCl3) δ 3.62 (broad s, 1H), 5.56 (dd, 1H, J=20, 3 Hz), 7.26-8.13 (m, 9H); 19F NMR (CDCl3, relative to CFCl3 -104.8 ppm (dd, 1F, JFF =238 Hz, JHF =3 Hz), -119.2 ppm (dd, 1F, JFF =238 Hz, JHF =20 Hz); mass spectrum (70 eV) m/e (relative intensity) 332 (9, M+), 143(44), 141(100, 77(33). Anal. Calcd. for C14H11ClF2O3S: C, 50.53; H, 3.33. Found: C, 50.49; H, 3.41.

Quelle