Gold(<scp>i</scp>)-catalyzed nucleophilic cyclization of β-monosubstituted <i>o</i>-(alkynyl)styrenes: a combined experimental and computational study
作者:Cintia Virumbrales、Marta Solas、Samuel Suárez-Pantiga、Manuel A. Fernández-Rodríguez、Marta Marín-Luna、Carlos Silva López、Roberto Sanz
DOI:10.1039/c9ob02126d
日期:——
The stereospecific gold(I)-catalyzed nucleophilic cyclization of β-monosubstituted o-(alkynyl)styrenes to produce C-1 functionalized 1H-indenes including challenging substrates and nucleophiles, such as β-(cyclo)alkyl-substituted o-(alkynyl)styrenes and a variety of alcohols as well as selected electron-rich aromatics, is reported. DFT calculations support the stereochemical outcome of the process
Drawing from a Pool of Radicals for the Design of Selective Enyne Cyclizations
作者:Sayantan Mondal、Rana K. Mohamed、Mariappan Manoharan、Hoa Phan、Igor V. Alabugin
DOI:10.1021/ol4028072
日期:2013.11.15
Despite the possibility of intermolecular attack at four different locations, the Bu3Sn-mediated radical cyclization of aromatic enynes is surprisingly selective. The observed reaction path originates from the least stable of the equilibrating pool of isomeric radicals produced by intermolecular Bu3Sn attack at the pi-bonds of substrates. The radical pool components are kinetically self-sorted via 5-exo-trig closure, the fastest of the four possible cyclizations. The resulting Sn-substituted indenes are capable of further transformations in reactions with electrophiles.
Muenzenmaier,W.; Straub,H., Synthesis, 1976, p. 49 - 51