Palladium‐Catalyzed Tail‐to‐Tail Reductive Dimerization of Terminal Alkynes to 2,3‐Dibranched Butadienes
作者:Hongyu Guo、Sheng Zhang、Yang Li、Xiaoqiang Yu、Xiujuan Feng、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/anie.202116870
日期:2022.3.21
a combination of pivalic acid and para-toluenesulfonic acid proved successful in favoring the selective highly chemo- and regioselective tail-to-tail reductive dimerization of terminalalkynes over the competitive head-to-taildimerization pathway. The target reaction, proposed to proceed via a cationic alkenyl palladium intermediate, presents a facile and straightforward approach for accessing 2,3-dibranched
Facile synthesis of dibranched conjugated dienes via palladium-catalyzed oxidative coupling of N-tosylhydrazones
作者:Huanfeng Jiang、Li He、Xianwei Li、Huoji Chen、Wanqing Wu、Wei Fu
DOI:10.1039/c3cc43593h
日期:——
developed. This process features readily available starting materials and mild reaction conditions. Further transformations of the obtained dibranched 1,3-dienes, through Diels-Alder reactions and indene synthesis, are also demonstrated, which reveal their great potential for synthetic utility.
A Cu-catalyzed regio- and enantioselective protoboration of 2,3-disubstituted 1,3-dienes is described. The protocol operates under mild conditions and is applicable to symmetrically and unsymmetrically substituted dienes, providing access to homoallylic boronates in consistently high yield, regioselectivity, and enantiomeric ratio. Preliminary investigations point to a complex mechanism.
描述了 2,3-二取代 1,3-二烯的 Cu 催化区域选择性和对映选择性原硼化反应。该方案在温和条件下运行,适用于对称和不对称取代的二烯,以一致的高产率、区域选择性和对映体比例提供同烯丙基硼酸酯。初步调查表明存在一个复杂的机制。
Novel synthesis of 2,3-diarylbuta-1,3-dienes from 1,4-dimethoxybutyne-2