Dynamic Kinetic Asymmetric [3 + 2] Annulation Reactions of Aminocyclopropanes
作者:Florian de Nanteuil、Eloisa Serrano、Daniele Perrotta、Jerome Waser
DOI:10.1021/ja5024578
日期:2014.4.30
asymmetric [3 + 2] annulation reaction of aminocyclopropanes with both enol ethers and aldehydes. Using a Cu catalyst and a commercially available bisoxazoline ligand, cyclopentyl- and tetrahydrofurylamines were obtained in 69-99% yield and up to a 98:2 enantiomeric ratio using the same reaction conditions. The method gives access to important enantio-enriched nitrogen building blocks for the synthesis of bioactive
Ring-Opening 1,3-Dichlorination of Donor–Acceptor Cyclopropanes by Iodobenzene Dichloride
作者:Lennart K. B. Garve、Philip Barkawitz、Peter G. Jones、Daniel B. Werz
DOI:10.1021/ol5029139
日期:2014.11.7
Donor–acceptor cyclopropanes are reacted with iodobenzenedichloride to afford ring-opened products bearing chlorine atoms in the 1- and 3-positions, adjacent to the donor and acceptor groups. A variety of different donors (e.g., alkyl, aryl, N, and O) and acceptor moieties (e.g., ketones, diesters, and dinitriles) are used.
methods for the convergent synthesis of (poly)cyclic scaffolds are urgently needed in synthetic and medicinal chemistry. Herein, we describe new annulation reactions of thioalkynes with phthalimide‐substituted donor–acceptor cyclopropanes, which gave access to highly substituted cyclopentenes and polycyclic ring systems. With silyl‐thioalkynes, the Lewis acid catalyzed [3+2] annulation reaction with