developed. A variety of eight-membered cyclic ethers with two contiguous tertiary stereocenters were obtained in high yields with excellent stereoselectivities. This reaction not only provides a new strategy for constructing enantioenriched eight-membered cyclic ethers but also demonstrates the practicability of ynones as C4-syntons for the synthesis of chiral medium-membered rings.
Palladium-catalyzed carbonylative coupling of benzyl chlorides with terminal alkynes to give 1,4-diaryl-3-butyn-2-ones and related furanones
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1039/c1ob06345f
日期:——
A general palladium-catalyzed carbonylative Sonogashira coupling of benzyl chlorides with terminal acetylenes has been established. Depending on the alkyne 1,4-diaryl-3-butyn-2-ones or substituted furanones are obtained in moderate to good yields. Best catalytic performance is achieved applying a mixed Pd(PPh3)Cl2/P(OPh)3 catalyst system.
A straightforward synthesis of selenylative carbo‐spirocyclisation from homologated‐ynones is presented trough visible light assisted intramolecular dearomatization. In the process, the substituted spiro‐triene‐2,8‐dione was readily transformed into various spiro‐cycles and substituted 2‐naphthols.
efficient method for the synthesis of fused eight-membered oxocino[2,3-c] pyrazoles from readily available acyclic starting materials in a single step. This reaction allows the formation of four new bonds and two rings in a highly regio- and diastereoselective manner, where twoadjacentstereocenters are created simultaneously in an atom-economic manner.
开发了一种新型 DBU 促进的炔酮与重氮化合物作为 N 端亲电子试剂的串联环化反应。该反应提供了一种简单有效的方法,用于从容易获得的无环起始材料一步合成稠合八元氧辛基[2,3- c ]吡唑。该反应允许以高度区域和非对映选择性的方式形成四个新键和两个环,其中以原子经济的方式同时创建两个相邻的立体中心。
Structurally divergent enantioselective synthesis of benzofuran fused azocine derivatives and spiro-cyclopentanone benzofurans enabled by sequential catalysis
作者:Rupkumar Khuntia、Sanat Kumar Mahapatra、Lisa Roy、Subhas Chandra Pan
DOI:10.1039/d3sc03239f
日期:——
An important objective in organic synthesis and medicinal chemistry is the capacity to access structurally varied and complex molecules rapidly and affordably from easily available starting materials. Herein, a protocol for the structurally divergent synthesis of benzofuran fused azocine derivatives and spiro-cyclopentanone benzofurans has been developed via chiral bifunctional urea catalyzed reaction