Brønsted Acid Mediated Novel Rearrangements of Diarylvinylidenecyclopropanes and Mechanistic Investigations Based on DFT Calculations
作者:Wei Li、Min Shi、Yuxue Li
DOI:10.1002/chem.200901172
日期:2009.9.7
program by using the B3LYP method have revealed that the pKa value of the Brønsted acid, as well as the entropy and solvent effects, plays a significant role in this reaction; these factors can discriminate the differences in the reactivity and regioselectivity among the Brønsted acids used in this reaction. In the presence of Lewis acid Sn(OTf)2, a butatrienecyclopane can produce the corresponding ring‐opened
在布朗斯台德酸Tf 2 NH(Tf:三氟甲磺酰基)的存在下,二芳基亚乙烯基环丙烷经历了新颖的重排,在加热时以良好的高收率得到相应的萘衍生物,而在布朗斯台德酸甲苯-4-磺酸的存在下(p -TSA),相应的三烯衍生物在温和的条件下以中等至良好的收率提供。使用B3LYP方法在基于密度泛函理论(DFT)和Gaussian03程序的相应机理研究中发现p K a布朗斯台德酸的值以及熵和溶剂效应在该反应中起着重要作用。这些因素可以区分用于该反应的布朗斯台德酸之间的反应性和区域选择性的差异。在路易斯酸Sn(OTf)2存在的情况下,丁三烯环窗格玻璃可以中等产率生产相应的开环产物。