According to the proper choice of reaction conditions, a regioselective ring closure of the 1,5-diketones I is achieved, either to II or III. This directed aldolisation was successfully applied to a short synthesis of the monoterpenoid piperitone.
The oxidation of ethyl α-methylacetoacetate with lead dioxide
作者:R. Brettle、D. Seddon
DOI:10.1039/j39700001320
日期:——
Oxidation of ethylα-methylacetoacetate with leaddioxide gives 4,5-diethoxycarbonyl-3,4,5-trimethylcyclopent-2-enone, diethyl αα′-diacetyl-αα′-dimethylsuccinate, 4-ethoxycarbonyl-3,4-dimethylcyclohex-2-enone and diethyl 2,4,5-trimethyl-3-oxahex-4-enedioate as the major products.