Molecular diversity of triphenylphosphine promoted reaction of electron-deficient alkynes and arylidene Meldrum acid (N,N'-dimethylbarbituric acid)
作者:Ying Han、Hui Zheng、Yuan-Yuan Zhang、Chao-Guo Yan
DOI:10.1016/j.cclet.2019.10.042
日期:2020.5
Abstract The three-component reaction of triphenylphosphine, dimethyl hex-2-en-4-ynedioate and arylidene N,N'-dimethylbarbituric acids in dry methylene dichloride at room temperature afforded trans-1,3-disubstituted 7,9-diazaspiro[4.5]dec-1-enes in good yields and with high diastereoselectivity. However, the similar three-component reaction with arylidene Meldrum acids resulted in a mixtures of cis/trans-1
摘要室温下,三苯基膦,己二-2-己-4-二甲基己二酸二甲酯和亚芳基N,N'-二甲基巴比妥酸在干燥的二氯甲烷中的三组分反应得到反式1,3-二取代的7,9-二氮杂螺[4.5] ] dec-1-烯具有高收率和高非对映选择性。然而,与亚芳基Meldrum酸的类似的三组分反应导致顺式/反式1,2-二取代的7,9-二氧杂螺[4.5] dec-1-烯的混合物。另外,三苯基膦,丁二酸二炔基二甲酯和亚芳基Meldrum酸的三组分反应得到多取代的5-(三苯基-λ5-亚膦酰基)环戊-1,3-二烯。提出了一种合理的反应机理,用于形成具有不同区域选择性和非对映选择性的各种产物。