Multicomponent reactions of phosphines, enynedioates and benzylidene malononitriles generated highly substituted cyclopentenes through an unexpected phosphine α-addition-δ-evolvement of an anion pathway
作者:Shih-Ching Chuang、Shih-Ping Sung、Jie-Cheng Deng、Mong-Feng Chiou、Day-Shin Hsu
DOI:10.1039/c5ob02445e
日期:——
Multicomponent reactions of phosphines, enynedioates and benzylidene malononitriles provide highly substituted syn-selective cyclopentenes appending the phosphorus ylide moiety in good yield with a diastereoselectivity of up to 100% through resonance-derived 1,5-dipolar species as the key intermediates, via the nucleophilic α(δ′)-attack of phosphines toward enynedioates followed by addition to benzylidene
膦,烯炔化物和亚苄基丙二腈的多组分反应提供了高取代的顺-选择性环戊烯,该化合物以高收率附加了磷叶立德部分,通过共振衍生的1,5-偶极物质作为关键中间体,通过亲核基团,非对映选择性高达100%。膦对烯键的α(δ')-攻击,然后加入亚苄基丙二腈和5 -exo-dig环化反应。通过计算分析,形成顺式和反式非对映异构体的总体反应都是放热的,分别为65.6和66.3 kcal mol -1在理论上处于B3LYP-D3 / 6-31G(d)水平,并且被动力学控制,这有利于顺式非对映异构体的形成。