Synthesis of 6-Substituted 3-(Alkoxycarbonyl)-5-aryl-α-pyrones
作者:Masayuki Yamashita、Takuya Miura、Saki Fujioka、Naoto Takemura、Hiroki Iwasaki、Minoru Ozeki、Naoto Kojima
DOI:10.1055/s-0033-1338575
日期:——
the Claisen decarboxylation reaction. An efficient synthesis of 6-substituted 3-(alkoxycarbonyl)-5-aryl-α-pyrones is reported. This methodology consists of the successive manipulation of an addition–elimination reaction between benzyl ketone derivatives and dimethyl methoxymethylenemalonate, and an acid-catalyzed condensation reaction. The synthesis is applicable to various 5-p-substituted-aryl 6-substituted
A skeletontransformation of 5-aryl-α-pyrones into dihydrofurans was developed. In the course of our study of the skeletontransformation reaction of α-pyrones by using dimethylsulfoxonium methylide, α-pyrones having an aryl group at the 5-position were converted into corresponding dihydrofurans as major products and bicyclo[3.1.0]hexanes as minor products. Selectivity for dihydrofurans was improved