Zinc-Catalyzed Synthesis of Functionalized Furans and Triarylmethanes from Enynones and Alcohols or Azoles: Dual XH Bond Activation by Zinc
作者:Jesús González、Javier González、Carmela Pérez-Calleja、Luis A. López、Rubén Vicente
DOI:10.1002/anie.201301625
日期:2013.5.27
Ba'zinc'ga! A zinc‐catalyzed sequence involving a cyclization with a subsequent CO, CN, or CC bond formation enables the preparation of a variety of valuable furfuryl ethers (with alcohols) and unsymmetrically substituted triarylmethane derivatives (with azoles or arenes). ZnCl2 serves as the catalyst.
A convenient one-pot Cu(I)-catalyzed strategy for regioselective synthesis of trisubstituted furan derivatives has been developed via (2-furyl) carbenecomplexes. This process has opened a new synthetic route to a variety of α-carbonyl furans using air as the oxidant affording furans in good yields.
Csp<sup>3</sup>–P versus Csp<sup>2</sup>–P Bond Formation: Catalyst-Controlled Highly Regioselective Tandem Reaction of Ene-Yne-Ketones with <i>H</i>-Phosphonates
various phosphorylated furans in good yields. A copper carbene generation or a Michael addition is proposed as the key step in the selective construction of the Csp3–P or Csp2–P bond, which is supported by carbene capture reactions and interval 31P NMR experiments. Furthermore, this method features inexpensive metal catalysts, no usage of oxidant, and high atom economy, which make it attractive and practical
在铜催化或碱促进的条件下,各种烯-炔酮与H-膦酸酯反应,以高收率提供各种磷酸化呋喃。卡宾碳捕获反应和间隔31 P NMR实验支持了铜卡宾的生成或迈克尔加成反应作为选择性构建Csp 3 -P或Csp 2 -P键的关键步骤。此外,该方法具有廉价的金属催化剂,不使用氧化剂和高原子经济性的特点,这使其具有吸引力和实用性。
Facile synthesis of cyanofurans via Michael-addition/cyclization of ene–yne–ketones with trimethylsilyl cyanide
作者:Yue Yu、Yang Chen、Wanqing Wu、Huanfeng Jiang
DOI:10.1039/c6cc08320j
日期:——
We have developed a Michael-addition/cyclization procedure between ene-yne-ketones and TMSCN under metal-free conditions. A wide range of cyanofurans were delivered in high yields, which could be further transformed to a...
Synthesis of C3-alkenylated 2,3,4-trisubstituted pyrrole derivatives through cyclization of methylene isocyanides and ene–yne–ketones
作者:Shasha Li、Gongruixue Zeng、Xiaoqi Xing、Zhiheng Yang、Feiyun Ma、Boxia Li、Weiyan Cheng、Jiankang Zhang、Ruoyu He
DOI:10.1039/d0nj05253a
日期:——
A mild, transition-metal-free and facile C3-alkenylated 2,3,4-trisubstituted pyrrole cyclization of methylene isocyanides with ene–yne–ketones in moderate to good yields was explored.