Reaktion #958449

Reaktionsgleichung

ethyl 3,4-dihydroxybenzoate

1,2-dibromoethane

K2CO3

→

ethyl 2,3-dihydrobenzo[b][1,4]dioxine-6-carboxylate

Ausbeute 23.0%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe residue was purified by silica gel chromatography with 20-50% EtOAc/hexane as eluants

Vorschrift

According to the procedure described in Example 6A Step 1, a mixture of ethyl 3,4-dihydroxybenzoate (5.465 g, 30 mmol), 1,2-dibromoethane (5.636 g, 30 mmol), and K2CO3 (6.219 g, 45 mmol) in DMF (100 mL) was heated at 70° C. overnight. The residue was purified by silica gel chromatography with 20-50% EtOAc/hexane as eluants to afford ethyl 2,3-dihydrobenzo[b][1,4]dioxine-6-carboxylate as an oil (1.423 g, 23%). 1H NMR (300 MHz, CDCl3) δ 7.58 (d, 1H), 7.56 (dd, 1H), 6.88 (d, 1H), 4.30 (m, 6H), 1.37 (t, 3H); LC-MS (ESI) m/z 209 (M+H)+.

Quelle