Cp∗Li as a base: application to palladium-catalyzed cross-coupling reaction of aryl-X or alkenyl-X (X=I, Br, OTf, ONf) with terminal acetylenes
作者:Minoru Uemura、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1016/j.tet.2007.11.095
日期:2008.2
The reaction of aryl-X or alkenyl-X (X=I, Br, OTf, ONf) with terminalacetylenes in the presence of a catalytic amount of Pd(OAc)2 provided the alkynylated products in good yields by using Cp∗Li (Cp∗=1,2,3,4,5-pentamethylcyclopentadienyl) as a base.
Synthesis, resolution, and antiplatelet activity of 3-substituted 1(3H)-isobenzofuranone
作者:Hua Yang、Gao-Yun Hu、Jun Chen、Yi Wang、Zhong-Hua Wang
DOI:10.1016/j.bmcl.2007.06.082
日期:2007.9
A series of 3-substituted-1(3H)-isobenzofuranone 6a-g and 7a-g were synthesized from phthalic anhydride. The compound 6a-g was resolved. The antiplatelet activities of these compounds were evaluated using in vitro experiment of platelet aggregation. The levels of antiplatelet activity were displayed as following sequence: l-isomer > dl-isomer > d-isomer, respectively. The alkylphthalide is more active than the corresponding alkenephthalide. All these compounds were less active than n-butylphthalide (NBP, 6c) and Aspirin (Asp). (c) 2007 Elsevier Ltd. All rights reserved.
Synthesis of phthalides via Pd/CNTs-catalyzed reaction of terminal alkynes and o-iodobenzoic acid under copper- and ligand-free conditions
作者:Lei Zhou、Huan-Feng Jiang
DOI:10.1016/j.tetlet.2007.09.170
日期:2007.11
A phosphine- and copper-free protocol for the synthesis of phthalides via Pd/CNTs-catalyzed tandem coupling-cyclization process has been developed. The palladium immobilized on CNTs showed high catalytic activity, and the reactions with a variety of terminal alkynes and o-iodobenoic acid proceeded smoothly to give phthalides in moderate to good yields catalyzed by 0.1% mmol Pd/CNTs. (c) 2007 Elsevier Ltd. All rights reserved.