Synthesis ofN-Aryl-5-alkylidene-2,5-dihydropyrrol-2-ones by“Cyclization/Dimroth Rearrangement” Reactions of 1,3-Dicarbonyl Dianions with Diimidoyl Dichlorides of Oxalic Acid
作者:Joachim T. Anders、Helmar Görls、Peter Langer
DOI:10.1002/ejoc.200300727
日期:2004.5
The reaction of dilithiated dicarbonyl compounds with oxaldiimidoyl dichlorides resulted in regio- and (E)/(Z)-diastereoselective formation of 5-alkylidene-3-arylamino-2,5-dihydropyrrol-2-ones. The products were formed by a domino “cyclization/Dimroth rearrangement” reaction. The mechanism and preparative scope of the cyclization was studied. The arylamino groups of the products were removed chemoselectively
二锂化二羰基化合物与草酰二亚胺酰二氯的反应导致 5-亚烷基-3-芳基氨基-2,5-二氢吡咯-2-酮的区域-和(E)/(Z)-非对映选择性形成。产物是通过多米诺“环化/Dimroth 重排”反应形成的。研究了环化的机理和制备范围。在温和条件下通过水解裂解以高产率化学选择性地去除产物的芳氨基。从药理学和合成的角度来看,N-芳基-5-亚烷基-3-羟基-2,5-二氢吡咯-2-酮产品具有相当大的意义。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)