Palladium-Catalyzed Cross-Coupling of Stereospecific Potassium Cyclopropyl Trifluoroborates with Aryl Bromides
作者:Guo-Hua Fang、Zheng-Jun Yan、Min-Zhi Deng
DOI:10.1021/ol036184e
日期:2004.2.1
excess KHF(2) afforded the corresponding potassium cyclopropyl trifluoroborates in high yields, which then underwent Suzuki-Miyaura cross-coupling reactions with aryl bromides to give cyclopropyl-substituted arenes in good yields with retention of configuration. This promises to be a useful method for the synthesis of enantiomerically pure cyclopropanes.
Stereospecific synthesis of all four isomeric 6,8-heneicosadien-11-ones: sex pheromone components of the painted apple moth Teia anartoides
作者:Daniel J. Comeskey、Barry J. Bunn、Simon Fielder
DOI:10.1016/j.tetlet.2004.08.095
日期:2004.10
The stereospecific synthesis of all four isomeric 6,8-heneicosadien-11-ones, sexpheromonecomponents of the painted apple moth, Teia anartoides, is reported using the Suzuki-coupling of vinyl boronic acid and vinyl iodide intermediates.
Synthesis and evaluation of 4-(substituted styryl/alkenyl)-3,5-bis(4-hydroxyphenyl)-isoxazoles as ligands for the estrogen receptor
作者:Terra Haddad、Rachel Gershman、Robert Dilis、David Labaree、Richard B. Hochberg、Robert N. Hanson
DOI:10.1016/j.bmcl.2012.06.097
日期:2012.9
A series of 3,5-bis(4-hydroxyphenyl) isoxazoles bearing a styryl/alkyl vinyl group at the 4-position were prepared and evaluated as ligands for the estrogen receptor-alpha (ER alpha). The target compounds were prepared using the Suzuki reaction to couple an iodo-isoxazole intermediate with a series of styryl/alkenyl boronic acids, followed by O-demethylation. The products were evaluated for their estrogen receptor-alpha ligand binding domain (ER alpha-LBD) binding affinity using a competitive binding assay. The 4-(4-hydroxy-styryl) derivative 4 h displays binding properties similar to those of the previously described pyrazole class of ER ligands, indicating that the ER alpha-LBD tolerates the presence of the added vinyl group at the 4-position of the isoxazole ring. (c) 2012 Elsevier Ltd. All rights reserved.
A Novel Method for the Construction of (<i>Z</i>,<i>E</i>)- or (<i>Z</i>,<i>Z</i>)-Conjugated Alkadienyl Carboxylates
作者:Rong He、Min-Zhi Deng
DOI:10.1021/ol026286p
日期:2002.8.1
[GRAPHICS]The stereocontrolled dehydrobromination of 1,2-dibromoethyl carboxylates giving (Z)-2-bromovinyl carboxylates could readily be approached by using DBU and a catalytic amount of hydroquinone as a base at -78 degreesC. The first investigation on the Suzuki-type cross-coupling of (2)-2-bromovinyl carboxylates as electrophiles with stereodefined alkenylboronic acids provides a novel method for the construction of (Z,E)or (Z,Z)-conjugated alkadienyl carboxylate moieties, which are often present in a range of natural products.