A nickel‐catalyzed asymmetric diarylation reaction of vinylarenes enables the preparation of chiral α,α,β‐triarylated ethane scaffolds, which exist in a number of biologically active molecules. The use of reducing conditions with arylbromides as coupling partners obviates the need for stoichiometric organometallic reagents and tolerates a broad range of functional groups. The application of an N‐oxyl
Asymmetric Reductive Dicarbofunctionalization of Alkenes via Nickel Catalysis
作者:Tianning Diao、David Anthony
DOI:10.1055/s-0040-1707900
日期:2020.9
Alkenes are an appealing functional group that can be transformed into a variety of structures. Transition-metal catalyzed dicarbofunctionalization of alkenes can efficiently afford products with complex substitution patterns from simple substrates. Under reductive conditions, this transformation can be achieved while avoiding stoichiometric organometallic reagents. Asymmetric difunctionalization of
Selective Divergent Synthesis of Indanols, Indanones, and Indenes via Acid-Mediated Cyclization of (<i>Z</i>)- and (<i>E</i>)-(2-Stilbenyl)methanols and Its Application for the Synthesis of Paucifloral F Derivatives
structurally related to the natural product paucifloral F. At higher temperatures, 1,2- and 2,3-disubstituted indenes could be selectively prepared in good to excellent yields. On the other hand, the (Z)-stilbenes, under similar conditions (PTS-Si), did not give the indanols; only the 1,2-disubstituted indenes could be obtained. To gain further insights into the stereochemistry at C2–C3 for the (Z)-stilbenes
The reduction at a mercury electrode in dimethylformamide of five variously substituted indenes bearing at least one (acidic) hydrogen at C(1) was carried out, under self-protonation conditions and in the presence of phenol as a proton donor. Reduction occurred exclusively at the C(2)–C(3) double bond of the five-membered ring and afforded the corresponding indans of various configurations, with a