Highly Regioselective Palladium‐Catalyzed Carboxylation of Allylic Alcohols with CO
<sub>2</sub>
作者:Tsuyoshi Mita、Yuki Higuchi、Yoshihiro Sato
DOI:10.1002/chem.201503359
日期:2015.11.9
stoichiometric transmetalation agent under a CO2 atmosphere (1 atm). This carboxylation proceeded in a highly regioselective manner to afford branched carboxylic acids predominantly. The β,γ‐unsaturated carboxylic acid thus obtained was successfully converted into an optically active γ‐butyrolactone, a known intermediate of (R)‐baclofen.
Hydrocarboxylation of Allenes with CO<sub>2</sub> Catalyzed by Silyl Pincer-Type Palladium Complex
作者:Jun Takaya、Nobuharu Iwasawa
DOI:10.1021/ja806677w
日期:2008.11.19
complex-catalyzed hydrocarboxylation of allenes under carbon dioxide to give synthetically useful beta,gamma-unsaturated carboxylic acids was developed. This novel CO2-fixation reaction is thought to proceed through the catalytic generation of sigma-allyl palladium species via hydropalladation of allenes, followed by its regioselective nucleophilic addition to CO2 in the presence of an appropriate
开发了三齿 PSiP 钳形钯配合物在二氧化碳下催化丙二烯加氢羧化,得到合成有用的 β, γ-不饱和羧酸。这种新型的 CO2 固定反应被认为是通过丙二烯的氢化钯催化生成 σ-烯丙基钯物种,然后在适当的还原剂存在下将其区域选择性亲核加成到 中进行的。该反应成功应用于带有酯、氨基甲酸酯、酮和烯烃等官能团的各种丙二烯,显示出该方案的高合成效用。
Copper-catalyzed C–C bond-forming transformation of CO<sub>2</sub> to alcohol oxidation level: selective synthesis of homoallylic alcohols from allenes, CO<sub>2</sub>, and hydrosilanes
A highly selective carbon-carbon bond-forming transformation of carbon dioxide (CO2) to the alcoholoxidation level has been disclosed. By employing a copper/bisphosphine catalyst system and hydrosilanes as the mild and...
Enantioselective Synthesis of Acyclic α-Quaternary Carboxylic Acid Derivatives through Iridium-Catalyzed Allylic Alkylation
作者:Samantha E. Shockley、J. Caleb Hethcox、Brian M. Stoltz
DOI:10.1002/anie.201707015
日期:2017.9.11
The first highly enantioselective iridium‐catalyzed allylic alkylation that provides access to products bearing an allylic all‐carbon quaternary stereogenic center has been developed. The reaction utilizes a masked acyl cyanide (MAC) reagent, which enables the one‐pot preparation of α‐quaternary carboxylic acids, esters, and amides with a high degree of enantioselectivity. The utility of these products
Compositions and methods for preparing β,γ-unsaturated acids
申请人:California Institute of Technology
公开号:US10336678B2
公开(公告)日:2019-07-02
The present disclosure provides methods for enantioselective synthesis of acyclic α-quaternary carboxylic acid derivatives via iridium-catalyzed allylic alkylation.