A Palladium-Catalyzed Enantioselective Alkylative Desymmetrization of <i>m</i><i>eso</i>-Succinic Anhydrides
作者:Eric A. Bercot、Tomislav Rovis
DOI:10.1021/ja046528b
日期:2004.8.1
Monoalkylation of cyclic anhydrides provides an opportunity to couple a carbon-carbon bond-forming event with the control of backbone stereochemistry. We have developed a palladium-JOSIPHOS catalyst system that desymmetrizes meso-succinic anhydrides using organozinc reagents as nucleophiles, and have found that, in many cases, this reaction proceeds at ambient temperature.
Selective Substituent Transfer from Mixed Zinc Reagents in Ni-Catalyzed Anhydride Alkylation
作者:Jeffrey B. Johnson、Robert T. Yu、Paul Fink、Eric A. Bercot、Tomislav Rovis
DOI:10.1021/ol0616337
日期:2006.9
mixed zinc reagents in Ni-catalyzed anhydride alkylation results in preferential transfer of substituents (Ph > Me > Et >> iPr approximately TMSCH2) for the ligands bipy, dppe, and iPrPHOX. Utilization of such mixed species allows the use of 0.55 equiv of the diorganozinc reagent, effectively transferring both desired substituents when used in conjunction with a suitable second zinc reagent.
在Ni催化的酸酐烷基化反应中使用混合锌试剂会导致配体bipy,dppe和iPrPHOX的取代基优先转移(Ph> Me> Et >> iPr约TMSCH2)。利用这种混合物质可以使用0.55当量的二有机锌试剂,当与合适的第二种锌试剂一起使用时,可以有效地转移两个所需的取代基。
Practical Synthesis of Chiral cis-Cyclohex-4-ene-1,2-dicarboxylic Acid Derivatives by Utilizing (4S)-Isopropyl-1,3-thiazolidine-2-thione
作者:Yoshimitsu Nagao、Tinh Van Dang、Motoyuki Miyamoto、Shigeki Sano、Motoo Shiro