Catalytic Intramolecular Cycloaddition Reactions by Using a Discrete Molecular Architecture
作者:Bijan Roy、Anthonisamy Devaraj、Rupak Saha、Suprita Jharimune、Ki-Whan Chi、Partha Sarathi Mukherjee
DOI:10.1002/chem.201702507
日期:2017.11.7
utilised as a molecular vessel to perform intramolecular cycloaddition reactions of O‐allylated benzylidinebarbituric acid derivatives inside its confined nanospace. The presence of a catalytic amount of MT‐1 promoted [4+2] cycloaddition reactions in a regio‐ and stereoselective manner, yielding the corresponding penta/tetracyclouracil derivatives in good yields under mild reaction conditions. This protocol
离散四方筒状的络合物(MT-1 )已被合成的协调驱动的自组装基于咔唑的tetraimidazole供体的大号和钯(II)90°受体,即,[顺式- (DPPF)的Pd (OTF)2 ](DPPF二苯基膦二=,光学传递函数= CF 3 SO 3 - )。复合MT-1通过多核NMR,ESI-MS和单晶X射线衍射分析(SCXRD)对其进行了表征,表明其对称的四面管状结构,具有由四个芳香壁描述的大空腔。该配位笼成功地用作分子容器,在其受限的纳米空间内进行了O-烯丙基化苄基巴比妥酸衍生物的分子内环加成反应。催化量MT-1的存在以区域和立体选择性的方式促进了[4 + 2]环加成反应,在温和的反应条件下,以高收率得到了相应的五/四环尿嘧啶衍生物。与在高温回流条件或固态熔体反应(SSMRs)下合成相似的苯并吡喃嘧啶二酮衍生物的文献报道相比,该方案很有趣。