Heterocycles’ ring-opening in reactions of 3-methyl-4-nitro-3-thiolene-1,1-dioxide with substituted hydrazines
作者:L. V. Lapshina、I. E. Efremova、M. I. Vakulenko、V. M. Berestovitskaya
DOI:10.1134/s107036321206028x
日期:2012.6
4-Nitro-3-thiolene-1,1-dioxides are the active heterocyclic sulfonitroalkenes able to interact with nucleophiles by the addition, vinyl substitution or salt formation pathways. The direction and effectiveness of these processes are determined by the nature of the substituents in the sulfolene ring, the reagents nature, and the reaction conditions [1, 2]. Thus, the addition of arylamines to the multiple
4-Nitro-3-thiolene-1,1-dioxides 是活性杂环磺基硝基烯烃,能够通过加成、乙烯基取代或成盐途径与亲核试剂相互作用。这些过程的方向和有效性取决于环丁砜环中取代基的性质、试剂性质和反应条件 [1, 2]。因此,芳胺加成到 3-methyl-4-nitro-3thiolene-1,1-dioxide I 的多重键上,在回流的乙醇中进行。更具活性的亲核试剂芳酰肼在室温下反应生成相应的迈克尔加合物 [3]。在回流乙醇中以等摩尔比收紧二氧化硝基硫烯I与苯甲酰肼的反应条件出乎意料地导致形成新的开链结构,(2-硝基乙基磺酰基)丙酮苯甲酰腙II。即使在室温下,硝基亚砜 I 与碱性更强的取代肼、氨基脲和苯肼的反应也会产生类似的直链硝基烷基砜 III 和 IV。DOI: 10.1134/S107036321206028X