Dialkylation of Ethyl 4-(Het)aryl-3-oxobutanoates as a Route to 5-(2-Oxoethyl)cyclopentenones
作者:Andrey G. Lvov、Alexey V. Zakharov、Konstantin A. Lyssenko、Vadim V. Kachala、Valerii Z. Shirinian
DOI:10.1055/s-0039-1689926
日期:2019.7
An unexplored ability of the long-known chemical transformation, Borsche’s cyclopentenone synthesis (the construction of a 1,4-diketone with subsequent base-induced cyclization), is reported. Double alkylation of ethyl 4-(het)aryl-3-oxobutanoates with 2-bromo-1-(het)arylethanones, with subsequent alkali treatment, provides access to cyclopentenones substituted with a 2-oxoethyl group at the 5-position
报道了一种长期已知的化学转化的未知能力,即 Borsche 的环戊烯酮合成(构建 1,4-二酮和随后的碱诱导环化)。4-(杂)芳基-3-氧代丁酸乙酯与 2-溴-1-(杂)芳基乙酮的双烷基化,随后进行碱处理,提供在 5 位被 2-氧乙基取代的环戊烯酮。这些产物可能作为杂环化的有价值的合成子,并且通过合成 4H-环戊二烯 [b] 噻吩衍生物证明了这一特征。