Methyl 1-bromocyclohexanecarboxylate reacts with zinc in the presence of cyclohexanecarbonyl chloride to give methyl 1-(cyclohexylcarbonyl)cyclohexanecarboxylate. Treatment of the latter with bromine leads to formation of methyl 1-(1-bromocyclohexylcarbonyl)cyclohexanecarboxylate which reacts with zinc and aromatic aldehydes, yielding 16-aryl-15-oxadispiro[5.1.5.3]hexadecane-7,14-diones.
Methyl 1-bromocyclohexanecarboxylate reacts with zinc in the presence of cyclohexanecarbonyl chloride to give methyl 1-(cyclohexylcarbonyl)cyclohexanecarboxylate. Treatment of the latter with bromine leads to formation of methyl 1-(1-bromocyclohexylcarbonyl)cyclohexanecarboxylate which reacts with zinc and aromatic aldehydes, yielding 16-aryl-15-oxadispiro[5.1.5.3]hexadecane-7,14-diones.
Methyl 1-bromocyclohexanecarboxylate reacts with zinc in the presence of cyclohexanecarbonyl chloride to give methyl 1-(cyclohexylcarbonyl)cyclohexanecarboxylate. Treatment of the latter with bromine leads to formation of methyl 1-(1-bromocyclohexylcarbonyl)cyclohexanecarboxylate which reacts with zinc and aromatic aldehydes, yielding 16-aryl-15-oxadispiro[5.1.5.3]hexadecane-7,14-diones.