Chloroprene as a Source of Fine Chemicals: Palladium-Catalyzed Synthesis of Terminal Allenes
摘要:
[GRAPHICS]Several functionalized terminal allenes were prepared in moderate to excellent yield by a palladium-catalyzed reaction of chloroprene (2-chloro-1,3-butadiene) with soft nucleophiles.
labelling experiments and DFT calculations were performed to provide insights into the reaction mechanism of this unprecedented transformation. In addition, one-pot tandem Diels–Alder reactions with various dienophiles could readily construct diverse bicyclic and tricyclic nitrogen heterocycles, which are ubiquitous core scaffolds for a variety of natural products and bioactives. High efficiency and exclusive
Dual Palladium/Photoredox-Catalyzed Enantioselective and Regioselective Decarboxylative Hydroaminoalkylation of Allenes
作者:Jun Zheng、Ali Nikbakht、Bernhard Breit
DOI:10.1021/acscatal.1c00153
日期:2021.3.19
atalyzed regio- and enantioselective decarboxylative hydroaminoalkylation of allenes with amino acids is reported. This mild, redox-neutral, and atom-economic process allows access to a range of protected vinyl 1,2-amino ethers in good yields with high levels of branched and enantioselectivity, when alkoxyallenes were employed. Conversely, with alkyl- and aryl-substituted terminalallenes as the substrates
La cyclisation du dimethyl-5,5octatriene-1,2,7ol-4 en (dimethyl-2,2 methylene-4 vinyl-5) cyclopentanol, est catalysee par le dichlorure de (p-diphenylphosphinopolystyrene) nickel et le chlorure de chrome (II)
La cyclisation du 二甲基-5,5octatriene-1,2,7ol-4 en (二甲基-2,2 亚甲基-4 乙烯基-5) 环戊醇, est catalysee par le dichlorure de (p-diphenylphosphinopoly苯乙烯) 镍和氯化铬 (二)
Rhodium-catalyzed cycloisomerization of allenenes via metalacycle intermediates
作者:Tatsuya Makino、Kenji Itoh
DOI:10.1016/s0040-4039(03)01461-8
日期:2003.8
In the presence of a catalytic amount of the rhodium complex, allenenes undergo cycloisomerization reactions to result in the selective formation of five and seven membered exo-alkylidenecarbocycles and heterocycles via novel exo-alkylidenei-hodacyclopentane intermediates. (C) 2003 Elsevier Ltd. All rights reserved.
Rhodium Complex-Catalyzed Cycloisomerization of Allenenes: Exo and Endo Cyclization Depending on the Auxiliary Ligands
作者:Tatsuya Makino、Kenji Itoh
DOI:10.1021/jo035551x
日期:2004.1.1
having an exo-alkylidene moiety. In this cycloisomerization, (E)- and (Z)-allenenes are transformed stereospecifically to the corresponding cyclic (E)- and (Z)-1,4-dienes, respectively. On the other hand, the reactions under carbon monoxide atmosphere exclusively afford seven-membered-ring products through an endo-mode cyclization. The unusual cyclization involves an allylic C−H activation process. The