Unexpected formation of 4,4-dimethyl-1,2-disubstituted-dicarbonyl cyclopentanes from ketone enolate anions and 1,3-diiodo-2,2-dimethylpropane
作者:Cecilia A. Barrionuevo、Luciana C. Schmidt、Juan E. Argüello
DOI:10.1039/c5nj03672k
日期:——
followed by subsequent double alkylation with bis-iodide yielding a cyclopentane adduct. This methodology allows the use of a simple potassium tert-butoxide as a base at room temperature for the formation of three C–C bonds resulting in a relatively complex five-membered ring diketone structure under transition-metal-free conditions.
通过在DMSO中将芳基甲基或烷基甲基酮烯醇酸根阴离子溶液与1,3-二碘-2-2,2-二甲基丙烷混合,可以轻松获得环状1,4-二羰基化合物。这代表了使用简单的二碘代烷烃作为试剂对酮烯醇酸根阴离子进行二聚化的第一个例子,随后用双碘化物进行了双烷基化,生成了环戊烷加合物。这种方法允许在室温下使用简单的叔丁醇钾作为碱来形成三个C–C键,从而在无过渡金属的条件下形成相对复杂的五元环二酮结构。