A regioselective approach for construction of 5-membered and 6-membered flavonoid is established by Pd catalyzed carbonylative cyclization of 2-iodophenol with terminal alkynes using different amine bases under mild reaction condition. The catalytic experiments found that piperazine preferentially accelerate 6-endo cyclization, and triethylamine mediated Pd catalyzed 5-exo cyclization. Under optimized
Palladium‐Catalyzed Carbonylation for General Synthesis of Aurones Using CO
<sub>2</sub>
作者:Zijun Huang、Yudong Li、Jiaxing Zhou、Yi Zhang、Jiacheng Wu、Yongkai Wu、Fan Zhang、Zhengjun Fang、Yuehui Li
DOI:10.1002/cssc.202202365
日期:——
A palladium-catalyzedcarbonylation of terminal aromatic alkynes and a waste hydrosilane, poly(methylhydrosiloxane) (PMHS), is carried out with 2-iodophenol using CO2 to produce aurones. A variety of terminal alkynes and substituted 2-iodophenols are transformed into aurones in good yields.
使用 CO 2与 2-碘苯酚对末端芳族炔烃和废氢硅烷、聚(甲基氢硅氧烷)(PMHS) 进行钯催化羰基化,以生产金酮。各种末端炔烃和取代的 2-碘酚以良好的收率转化为金酮。
Highly enantioselective 1,3-dipolar cycloaddition of imino esters with benzofuranone derivatives catalyzed by thiourea−quaternary ammonium salt
Highly enantioselective 1, 3-dipolar cycloaddition of 2-arylidene-benzofuran- 3(2H)-ones with imino esters catalyzed by thiourea−quaternary ammonium salts has been developed. This reaction provides efficient construction of a range of chiral spiro[benzofuran-2,3′-pyrrolidine] in high yields (up to 99%) and with good enantioselectivities (up to 99% ee) under mild conditions.