Synthesis of γ-(2,4-Dioxobut-1-ylidene)butenolides by Reaction of Masked 1,3-Dicarbonyl Dianions with Maleic Anhydrides and Phthaloyl Dichloride
作者:Peter Langer、Uwe Albrecht、Van Thi Nguyen
DOI:10.1055/s-2006-926383
日期:——
γ-(2,4-Dioxobut-1-ylidene)butenolides were prepared with very good regioselectivity by reaction of (2,4-dioxobutylidene)triphenylphosphoranes with maleic anhydrides. The reaction of 1,3-bis-silyl enol ethers with phthaloyl dichloride afforded benzo-annulated γ-(2,4-dioxobut-1-ylidene)butenolides; the formation of these products can be explained by formation of iso-phthaloyl dichloride and attack of the bis-silyl enol ether onto the latter.
(2,4-二氧代丁-1-亚基)丁烯内酯是通过(2,4-二氧代丁-1-亚基)三苯基膦与马来酸酐反应制备的,具有非常好的区域选择性。1,3-双硅烷烯醇醚与邻苯二甲酰二氯化物的反应生成了苯annulated δ³-(2,4-二氧代丁-1-亚基)丁烯内酯;这些产物的形成可解释为异邻苯二甲酰二氯化物的形成和双硅烷烯醇醚对后者的攻击。