Magnesium-promoted reductive coupling of chlorotrialkylsilanes and tropone or tropone acetal in DMF, followed by oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone in benzene gives 2-trialkyl...
The preparation of 4-alkyl (or aryl) tropones has easily been accomplished by the anodic oxidation of 1-methoxy-4-alkyl (or aryl) cycloheptatrienes which were synthesized by the regioselective addition of alkyl or aryl lithium to 3-position of 7,7-dimethoxyeycloheptatriene followed by the thermal 1,5-hydrogen shift of the resulting 3-methoxy-7-alkyl (or aryl) cycloheptatrienes.
compound to a tropylium salt, by the anodic oxidation of CHT in methanol. The further anodic oxidation of 3-MCHT prepared from 7-MCHT has been found to be an effective method of synthesis of tropone and tropolone.