A substrate-dependent reaction of 1-aryl-2-alkyl-1,2-diketones with 2-aroyl-1-chlorocyclopropanecarboxylates: selective access to 2′,5′-dicyclopropoxy-1,1′:4′,1′′-teraryls and pentafulvenes
作者:Meher Prakash、Poonam Rani、Sampak Samanta
DOI:10.1039/d2ob00971d
日期:——
having electron-poor functionalities at the para and meta-positions of 1,2-diketones led to 2,5-diarylhydroquinones selectively via a cyclodimerization/double oxa-Michael process with highly strained cyclopropenes. However, when 1-naphthyl/electron-donating aryl/ortho-aryl-substituted 1,2-diketones were chosen, the Michael-initiated ring expansion reaction (C–C and CC bonds) took place under the same
一种有趣的底物控制一锅法,用于高度取代的 2',5'-dicyclopropoxy-1,1':4',1''-teraryls 和 6-hydroxypentafulvenes,涉及各种 1,2-二酮和 2-aroyl-1作为由Cs 2 CO 3触发的3C Michael受体的-氯环丙烷羧酸盐已经被开发出来。我们注意到 1,2-二酮在该反应中起决定性作用以确定产物的选择性。例如,在1,2-二酮的对位和间位具有贫电子官能团的芳环通过具有高应变环丙烯的环二聚/双氧杂迈克尔过程选择性地产生 2,5-二芳基对苯二酚。然而,当 1-萘基/给电子芳基/邻选择-芳基取代的 1,2-二酮,迈克尔引发的扩环反应(C-C 和 C C 键)在相同的条件下发生,主要产生相应的五富烯。此外,该反应具有良好的非对映选择性、广泛的底物范围、良好的官能团耐受性、无过渡金属工艺等几个重要特征。