850011-76-6Relevant articles and documents
Different Selectivities in the Insertions into C(sp2)?H Bonds: Benzofulvenes by Dual Gold Catalysis Competition Experiments
Plajer, Alex J.,Ahrens, Lukas,Wieteck, Marcel,Lustosa, Danilo M.,Babaahmadi, Rasool,Yates, Brian,Ariafard, Alireza,Rudolph, Matthias,Rominger, Frank,Hashmi, A. Stephen K.
supporting information, p. 10766 - 10772 (2018/08/03)
An unprecedented, often almost quantitative access to tricyclic aromatic compounds by dual gold catalysis was developed. This synthetic route expands the scope of benzofulvene derivatives through a C(sp2)?H bond insertion in easily available starting materials. The insertion takes place with an exclusive chemoselectivity with respect to the competing aromatic C?H positions. A bidirectional synthesis with two competing ortho-aryl C?H bonds in the selectivity-determining step also shows perfect selectivity; this result is explained by a computational investigation of the two conceivable intermediates. The intramolecular competition of two non-equivalent aryl C?H bonds with a benzylic methyl group also showed perfect selectivity.
A highly efficient and selective AuI-catalyzed tandem synthesis of diversely substituted pyrrolo[1,2-a]quinolines in aqueous media
Liu, Xin-Yuan,Che, Chi-Ming
, p. 3805 - 3810 (2008/12/23)
(Chemical Equation Presented) Bicycles built in water: The Au I-catalyzed tandem cyclization of 1-amino-4-alkynes with alkynes in water offers a simple and efficient method for the synthesis of diversely substituted pyrrolo[1,2-a]quinolines with good to excellent product yields and excellent regio- and chemoselectivities (see scheme).
Metalated nitriles: Organolithium, -magnesium? and -copper exchange of α-halonitriles
Fleming, Fraser F.,Zhang, Zhiyu,Liu, Wang,Knochel, Paul
, p. 2200 - 2205 (2007/10/03)
(Chemical Equation Presented) α-Halonitriles react with alkyllithium, organomagnesium, and lithium dimethylcuprate reagents generating reactive, metalated nitriles. The rapid halogen-metal exchange with alkyllithium and Grignard reagents allows selective exchange in the presence of reactive carbonyl electrophiles, including aldehydes, providing a high-yielding alkylation protocol. Lithiated and magnesiated nitriles react with propargyl bromide by SN2 displacement whereas organocopper nitriles react by S N2′ displacement, correlating with the formation of a C-metalated nitrile.