Cesium carbonate → Ethylacetate heptane

Participants

Reaction Steps

5 g (16 mmol) of 4-ethoxymethoxy-5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-2-naphthalene boronic acid are dissolved in 100 mL of toluene. 26 g (80 mmol) of caesium carbonate are added and the medium is degassed for 15 minutes with a flow of nitrogen. 14 mg (0.8 mmol) of palladium chloride are added, followed by 5.47 g (22 mmol) of methyl 6-chlorocarbonyl-2-naphthalenecarboxylate in 1 g portions. The reaction medium is refluxed for 15 hours and then hydrolysed and extracted with ethyl acetate. The residue obtained is purified by chromatography (eluent: 9/1 heptane/ethyl acetate). The product is then recrystallized from an ethyl acetate/heptane mixture (m=4.3 g; yield=59%; m.p.=96° C.).

Provenance & Evidence