Preparation of aryl ketones via Ni-catalyzed Negishi-coupling reactions with acid chlorides
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/j.tetlet.2011.01.135
日期:2011.3
A Ni-catalyst-catalyzed cross-coupling reaction of organozinc reagents with acid chlorides has been successfully developed. Mild reaction conditions were required to complete the coupling reactions affording the corresponding aryl ketones in good to excellent yields.
Directed metalation and regioselective functionalization of 3-bromofuran and related heterocycles with NaHMDS
作者:Hang Zhao、John W. Dankwardt、Stefan G. Koenig、Surendra P. Singh
DOI:10.1016/j.tetlet.2011.10.158
日期:2012.1
A mild and regioselective functionalization protocol for 3-bromofuran and analogs has been developed. Selective metalation and functionalization of C2 can be achieved as a result of the directing effect of the adjacent electron-withdrawing bromo group. In addition, the C5 position can also be selectively functionalized by blocking the C2 position via silylation or by simply controlling the reaction temperature. These functionalized compounds bearing a C3 bromo substituent may be further elaborated by utilizing a Suzuki-Miyaura cross-coupling procedure. (C) 2011 Elsevier Ltd. All rights reserved.
Conversion of tributylstannylferrocene to a variety of heteroaryl ferrocenes
作者:Chao-Min Liu、Bao-Hua Chen、Wan-Yi Liu、Xiao-Li Wu、Yong-Xiang Ma
DOI:10.1016/s0022-328x(99)00733-0
日期:2000.4
Tributylstannylferrocene (Fc-SnBu3) was converted to a variety of heteroaryl ferrocenes, such as 2-thiophenyl, 3-thiophenyl, 3-pyridyl, 3-quinolyl, 4-oxazolyl and 4-isoxazolyl ferrocene, by using Pd-catalyzed reactions. The Stille-coupling catalyst (PdCl2-PPh3) promotes the reaction between Fc-SnBu3 and electron-deficient heterocyclic bromides, while a modified catalyst (Pd-Ph3P-CuO) proves to be the choice for the coupling of Fc-SnBu3 with electron-rich heterocyclic bromides. (C) 2000 Elsevier Science S.A. All rights reserved.