The CH Activation/1,3-Diyne Strategy: Highly Selective Direct Synthesis of Diverse Bisheterocycles by Rh<sup>III</sup>Catalysis
作者:Da-Gang Yu、Francisco de Azambuja、Tobias Gensch、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.201403782
日期:2014.9.1
The reactivity and selectivity of 1,3‐diynes in transition‐metal‐catalyzed CH activation is exploited to quickly assemble diverse polysubstituted bisheterocycles, which are highly important but difficult to access. By using the CH activation/1,3‐diyne strategy, we overcame the challenges of selectivity (chemo‐, regio‐, and mono‐/diannulation) and constructed seven kinds of adjacent bisheterocycles
Copper-catalyzed rearrangement of oximes into primary amides
作者:Sumeet K. Sharma、Simon D. Bishopp、C. Liana Allen、Ruth Lawrence、Mark J. Bamford、Alexei A. Lapkin、Pawel Plucinski、Robert J. Watson、Jonathan M.J. Williams
DOI:10.1016/j.tetlet.2011.05.129
日期:2011.8
amides is catalyzed by simple copper salts. The use of homogeneous Cu(OAc)2 (1–2 mol %) was found to be effective for this transformation at 80 °C. The reaction was successful with either conventional or microwave heating. CuO and CuO/ZnO on activated carbon provided a competent reuseable heterogeneouscatalyst which could be used in a batchprocess or in flow. Copper salts are much cheaper than the precious
Rh(III)-Catalyzed Synthesis of Multisubstituted Isoquinoline and Pyridine <i>N</i>-Oxides from Oximes and Diazo Compounds
作者:Zhuangzhi Shi、Dennis C. Koester、Mélissa Boultadakis-Arapinis、Frank Glorius
DOI:10.1021/ja406338r
日期:2013.8.21
Multisubstituted isoquinoline and pyridine N-oxides have been prepared by Rh(III)-catalyzed cyclization of oximes and diazo compounds via aryl and vinylic C-H activation. This intermolecular annulation involving tandem C-H activation, cyclization, and condensation steps proceeds under mild conditions, obviates the need for oxidants, releases N-2 and H2O as the byproducts, and displays a broad substituent scope.