substrate-directed regiochemistry of the cobalt-catalysed 1,4-hydrovinylation reaction is described. A variety of symmetrical and unsymmetrical 2,3-disubstituted 1,3-dienes are synthesised by ruthenium-catalysed enyne metathesis, and then reacted with a terminal alkene catalysed by cobalt(II) bromide-[1,2-bis(diphenylphosphino)ethane] [CoBr2(dppe)] under reductive conditions. The regiochemistry of the branched
Dehydrogenative Aza-[4 + 2] Cycloaddition of Amines with 1,3-Dienes via Dual Catalysis
作者:Xiaoxiao Chen、Guoxiang Zhang、Rong Zeng
DOI:10.1021/acs.orglett.1c02558
日期:2021.9.17
We describe a synergistic utilization of copper catalysis and proton-transfer catalysis that enables an atom- and step-economical aza-[4 + 2] cycloaddition reaction of readily available N-arylamino carbonyl compounds with simple 1,3-dienes. The reaction proceeds smoothly under an air atmosphere and produces water as the sole side product. Whereas the amines can directly serve as the C- and N-atom donors
我们描述了铜催化和质子转移催化的协同利用,使容易获得的N-芳基氨基羰基化合物与简单的 1,3-二烯进行原子和步骤经济的氮杂-[4 + 2] 环加成反应。反应在空气气氛下顺利进行,并产生水作为唯一的副产物。虽然胺可以直接作为 C 和 N 原子供体,但这种操作简单的方案提供了绿色、快速和高效的 1,2,3,6-四氢吡啶,范围广泛。
3,4-Dimethylene five-membered heterocycles and symmetrically disubstituted 1,3-butadienes from 2,3-bis(bromomethyl)-1,3-butadiene
作者:Y. Gaoni
DOI:10.1016/s0040-4039(01)96219-7
日期:1973.1
GAONI YE.; SADEH SH., J. ORG. CHEM., 1980, 45, NO 5, 870-881