Synthesis, structure, and reactivity of (triphenylarsoranylidene)methylcyclohepta-2,4,6-trienone derivatives: reactions with heterocumulenes and an activated acetylene
作者:Yuhki Mitsumoto、Makoto. Nitta
DOI:10.1039/b205612g
日期:2002.10.7
Stable arsonium ylide derivatives 7a,b bearing cyclohepta-2,4,6-trienyl and electron-withdrawing CO2Et and CN groups, respectively, have been prepared for the first time through a reaction of 2-chlorocyclohepta-2,4,6-trienone with the corresponding arsonium methylide derivatives in the presence of ButOK. Compounds 7a,b are isolated as stable crystalline compounds, which do not undergo hydrolysis even
稳定的叶立德衍生物7a,b轴承环庚-2,4,6-三烯基和吸电子基团CO 2 Et和CN分别是通过与2-氯环庚-2,4,6-三烯酮在卜的存在相应的鉮甲基氧衍生物吨确定。化合物7a,b被分离为稳定的结晶化合物,不会经历水解即使在酸性条件下。X射线晶体分析表明,它们的As–O键距(7a为2.31Å,7b为2.39Å)低于范德华半径的总和(3.37Å),因此,砷和氧元素。为了构建一系列环庚环杂环并为了更好地理解一系列砷化钠,允许7a,b与二甲基碳杂杂环烯反应,异硫氰酸苯酯,二苯基碳二亚胺基和 异氰酸苯酯,在Wittig型反应中,随后进行电环化或正式的[8 + 2]型环加成消除 三苯ar硫醚 或者 氧化物 给 2 H-环庚[ b ]呋喃-2-硫酮, 它的 亚胺, 2-苯基亚氨基-2 H-环庚[ b ]吡咯, 和 2 H-环庚[ b ]呋喃-2-酮。另一方面,7a,b与乙炔二羧酸二甲酯 (DMAD)给