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
作者:Muenzenmaier,W.、Straub,H.
DOI:——
日期:——
Regio- and Stereoselective Construction of Highly Functionalized 3-Benzazepine Skeletons through Ring-Opening Cycloamination Reactions Catalyzed by Gold
作者:Xiangwei Du、Shuang Yang、Jingyu Yang、Yuanhong Liu
DOI:10.1002/chem.201002502
日期:2011.4.26
Ring size under control: Highlyfunctionalized 1‐amino‐ or 1‐hydroxy‐1H‐benzo[d]azepines have been prepared through a gold‐catalyzed cyclization of (o‐alkynyl)phenyl aziridines with heteronucleophiles. After removal of the phthalimido group, the products can be further transformed into 1H‐benzo[d]azepin‐1‐ones (see scheme; IBX=2‐iodoxybenzoic acid, Phth=pthalimido).
环的大小受到控制:高功能化的1-氨基或1-羟基-1 H-苯并[ d ]氮杂环庚烷是通过(o-炔基)苯基氮丙啶与杂多亲核试剂的金催化环化反应制备的。除去邻苯二甲酰亚胺基团后,可以将产物进一步转化为1 H-苯并[ d ] azepin-1-酮(参见方案; IBX = 2-碘氧基苯甲酸,Phth =邻苯二甲酰亚胺)。
Gold(<scp>i</scp>)-catalyzed diastereoselective synthesis of 1-α-oxybenzyl-1<i>H</i>-indenes
作者:Cintia Virumbrales、Samuel Suárez-Pantiga、Marta Solas、Manuel A. Fernández-Rodríguez、Roberto Sanz
DOI:10.1039/c8ob00406d
日期:——
The gold(I)-catalyzed oxycyclization of β-aryl monosubstituted o-(alkynyl)styrenes gives rise to 1-α-methoxy or 1-α-hydroxybenzyl-1H-indenes in a diastereospecific way. In contrast to β,β-disubstituted o-(alkynyl)styrenes, the stereochemical outcome of this process, diastereospecific reaction supports the higher contribution of a gold intermediate with a cyclopropylcarbene-like character.