Copper-Catalyzed Oxidative Alkynylation of Diaryl Imines with Terminal Alkynes: A Facile Synthesis of Ynimines
作者:Anouar Laouiti、Mohamed M. Rammah、Mohamed B. Rammah、Jérome Marrot、François Couty、Gwilherm Evano
DOI:10.1021/ol2032152
日期:2012.1.6
An efficient copper-mediated method for the oxidative alkynylation of diaryl imines with terminalalkynes is reported. This reaction provides the first catalytic and general synthesis of ynimines and allows for an easy preparation of these useful building blocks. An improved copper-catalyzedoxidative dimerization of imines to azines and the synthesis of dienes and azadienes from ynimines are also
Isoxazolodihydropyridinones: 1,3-Dipolar Cycloaddition of Nitrile Oxides onto 2,4-Dioxopiperidines
作者:Keith C. Coffman、Timothy P. Hartley、Jerry L. Dallas、Mark J. Kurth
DOI:10.1021/co200200u
日期:2012.4.9
Practical and efficient methods have been developed for the diversity-oriented synthesis of isoxazolodihydropyridinones via the 1,3-dipolar cycloaddition of nitrile oxides onto 2,4-dioxopiperidines. A select few of these isoxazolodihydropyridinones were further elaborated with triazoles by copper-catalyzed azide-alkyne cycloaddition reactions. A total of 70 compounds and intermediates were synthesized and analyzed for drug likeness. Sixty-four of these novel compounds were submitted to the NIH Molecular Libraries Small Molecule Repository for high-throughput biological screening.
Highly Site- and Enantioselective Cu-Catalyzed Allylic Alkylation Reactions with Easily Accessible Vinylaluminum Reagents
作者:Yunmi Lee、Katsuhiro Akiyama、Dennis G. Gillingham、M. Kevin Brown、Amir H. Hoveyda
DOI:10.1021/ja0782192
日期:2008.1.1
An efficient method for catalytic asymmetric allylic alkylation (AAA) of allylic phosphates with vinylaluminum reagents is reported. The vinylmetal reagents are prepared by reaction of commercially available DIBAL-H and a terminal alkyne. The resulting vinylaluminum reagent can be used directy, without isolation or purification. AAA reactions are promoted in the presence of 0.5-2.5 mol % of a readily available chiral N-heterocyclic carbene (NHC) complex and 1-5 mol % commercially available and air stable Cu salt (CUCl2-2H(2)O). The desired products are typically obtained within 2-12 h in 74% to 95% isolated yield, 77% to >98% ee, and in >98% E selectivity: >98% S(N)2' selectively is obtained in all but one instance (90%). The hydroalummation/catalytic AAA sequence can be performed in a single vessel, on gram scale.
Mondon, Justus Liebigs Annalen der Chemie, 1952, vol. 577, p. 181,196