Reaktion #91077

Reaktionsgleichung

ethyl 1-(2-ethoxy-2-oxoethyl)-2-oxocyclopentanecarboxylate

→

title compound

Ausbeute 75.1%

2-(2-Oxocyclopentyl)acetic Acid

Ausbeute 75.1%

Lösungsmittel

HOAc

HCl

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe solvent was removed under reduced pressure
2. 2
   Sonstigethe residue was partitioned between EtOAc (500 mL) and H2O (200 mL)
3. 3
   SonstigeAqueous layer was separated
4. 4
   Extraktionextracted with EtOAc (2×250 mL)
5. 5
   WaschenThe combined organic layers were washed with H2O (300 mL), brine (300 mL)
6. 6
   Trocknendried over Na2SO4
7. 7
   Sonstigedecanted
8. 8
   Einengenconcentrated

Vorschrift

A solution of ethyl 1-(2-ethoxy-2-oxoethyl)-2-oxocyclopentanecarboxylate (50.0 g, 206 mmol) in HOAc (500 mL) and 6 M HCl (250 mL) was heated at 100° C. for 6 h. The solvent was removed under reduced pressure and the residue was partitioned between EtOAc (500 mL) and H2O (200 mL). Aqueous layer was separated and extracted with EtOAc (2×250 mL). The combined organic layers were washed with H2O (300 mL), brine (300 mL), dried over Na2SO4, decanted and concentrated to yield the title compound as a white solid (22 g). 1H NMR (400 MHz, CDCl3) δ ppm 1.59-1.72 (m, 1H), 1.75-1.90 (m, 1H), 2.03-2.10 (m, 1H), 2.20 (dd, J=10.9, 8.9 Hz, 1H), 2.30-2.40 (m, 2H), 2.40-2.50 (m, 2H), 2.80 (dd, J=15.7, 7.2 Hz, 1H), 11.5 (s, 1H).

Quelle