Chiral Cyclometalated Oxazoline Gold(III) Complex-Catalyzed Asymmetric Carboalkoxylation of Alkynes
作者:Jia-Jun Jiang、Jian-Fang Cui、Bin Yang、Yulu Ning、Nathanael Chun-Him Lai、Man-Kin Wong
DOI:10.1021/acs.orglett.9b02171
日期:2019.8.16
O′-chelated 4,4′-biphenol cyclometalated oxazoline gold(III) complexes has been developed. A high yield (≤89%) and a high enantioselectivity (≤90% ee) were achieved in asymmetric carboalkoxylation of alkynes. Enantioselectivity could be significantly improved from 19% to 90% ee by increasing the steric size of the substituent on the chiral oxazoline ligand. Catalytically active AuIII species and the origin
Gold-Catalyzed Formal Cycloaddition of 2-Ethynylbenzyl Ethers with Organic Oxides and α-Diazoesters
作者:Samir Kundlik Pawar、Chiou-Dong Wang、Sabyasachi Bhunia、Appaso Mahadev Jadhav、Rai-Shung Liu
DOI:10.1002/anie.201303016
日期:2013.7.15
A world of possibilities: Gold‐catalyzed reactions of 2‐ethynylbenzyl ethers with organicoxides and α‐diazoesters gave 1,3‐dihydroisobenzofuran and naphthalene derivatives, respectively (see scheme; EWG=electron‐withdrawing group). Mechanisms for the formation of the formal cycloadducts were elucidated by isotope labeling.
A gold-catalyzed hydrogen bond-directed tandem cyclization strategy to synthesize indeno-chromen-4-one and indeno-quinolin-4-one derivatives has been developed.
Several ferrocenophanes, in which the two cyclopentadienyl rings are linked by acetylenic and olefinicbonds and aromatic rings, have been synthesized via the titanium-induced reductive coupling of the corresponding formyl compounds. The structures of these ferrocenophane compounds were determined by means of their IR and NMR spectra. The transannular π-electronic interactions between the two chromophores
已经通过钛诱导的相应甲酰基化合物的还原偶联合成了几种二茂铁,其中两个环戊二烯基环通过炔键和烯键以及芳环连接。这些二茂铁化合物的结构是通过它们的 IR 和 NMR 光谱确定的。在电子光谱的基础上检查了两个发色团之间的跨环 π-电子相互作用。
A
<scp>Copper‐Catalyzed</scp>
[5+1] Cycloaddition of Terminal Alkynes with Diazo Esters through a Tandem 1,
<scp>
5‐
<i>H</i>
‐Shift
</scp>
Cyclization
作者:Tonggang Hao、Min Shi、Yin Wei
DOI:10.1002/cjoc.202200614
日期:2023.2
A copper-catalyzed [5+1] cycloaddition reaction of terminal alkynes with diazo esters for the rapid construction of protected naphthalen-1(2H)-one derivatives in moderate to good yields has been disclosed along with good functional group compatibility and a broad substrate scope. The mechanistic investigations reveal that this tandem cyclization process proceeds through a Cu(I)-catalyzed coupling of
已经公开了铜催化的末端炔烃与重氮酯的 [5+1] 环加成反应,用于以中等至良好的收率快速构建受保护的萘-1(2 H )-酮衍生物,以及良好的官能团相容性和广泛的应用底物范围。机理研究表明,该串联环化过程通过 Cu(I) 催化的末端炔烃与重氮乙酸酯的偶联、1,5 -H转移过程和通过丙二烯中间体的热诱导周环反应进行。本文还介绍了所获得的环加合物向萘酮、萘酚和二氢萘酚的合成用途和进一步转化。