A New Class of Enehydroxylamino Ketones− (R)-2-(1-Hydroxy-4,4,5,5-tetraalkylimidazolidin-2-ylidene)ethanones: Synthesis and Reactions
作者:Vladimir A. Reznikov、Galina I. Roshchupkina、Dmitrii G. Mazhukin、Pavel A. Petrov、Sergei A. Popov、Sergey V. Fokin、Galina V. Romanenko、Tatjana V. Rybalova、Yuri V. Gatilov、Yuri G. Shvedenkov、Irina G. Irtegova、Leonid A. Shundrin、Victor I. Ovcharenko
DOI:10.1002/ejoc.200300536
日期:2004.2
Three approaches to the synthesis of (R)-2-(1-hydroxy-4,4,5,5-tetraalkylimidazolidin-2-ylidene)ethanones 1 are described: (a) condensation of 1,2-bishydroxylamines with β-ketoaldehyde synthons, (b) treatment of metallated 1-hydroxy-2-methyl-4,5-dihydroimidazoles with esters, and (c) 1,3-dipolar cycloaddition between 1-hydroxy-4,5-dihydroimidazole-3-oxide and DMAD. The reactivity of 1 with electrophiles
描述了合成 (R)-2-(1-羟基-4,4,5,5-四烷基咪唑烷-2-亚基) 乙酮 1 的三种方法:(a) 1,2-双羟胺与 β-酮醛的缩合合成子,(b) 用酯处理金属化 1-羟基-2-甲基-4,5-二氢咪唑,和 (c) 1-羟基-4,5-二氢咪唑-3-氧化物和 DMAD 之间的 1,3-偶极环加成. 已经研究了 1 与亲电试剂的反应性。环外亚甲基(烯胺)碳原子被证明是亲电攻击的主要位点。合成的氯取代 1-羟基-2-乙炔咪唑烷与氰化钠反应形成相应的腈。这些腈的氧化伴随着持久性乙烯基氮氧化合物的形成而发生,它们作为潜在的顺磁性配体是令人感兴趣的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany,