mechanistic investigations, including (1)H and (31)P(1)H} NMR studies; isolation and characterization of several catalytic intermediates, Pt(xantphos)Cl(2), Pt(eta(2)-C(3)H(5)OH)(xantphos), etc; confirmation of the structure of [Pt(eta(3)-allyl)(xantphos)]OTf by X-ray crystallographic analysis; and crossover experiments, suggested that formation of the pi-allylplatinum complex through the elimination of water
Hydrogen-Bond-Assisted Activation of Allylic Alcohols for Palladium-Catalyzed Coupling Reactions
作者:Yasemin Gumrukcu、Bas de Bruin、Joost N. H. Reek
DOI:10.1002/cssc.201300723
日期:2014.3
We report direct activation of allylicalcohols using a hydrogen‐bond‐assisted palladium catalyst and use this for alkylation and amination reactions. The novel catalyst comprises a palladium complex based on a functionalized monodentate phosphoramidite ligand in combination with urea additives and affords linear alkylated and aminated allylic products selectively. Detailed kinetic analysis show that
Reactions of amines and active methylene compounds with buta-1,3-diene and isoprene: catalysis by nickel, cobalt, rhodium, and iridium complexes
作者:Raymond Baker、Alan Onions、Roger J. Popplestone、Trevor N. Smith
DOI:10.1039/p29750001133
日期:——
amounts of hydrochloric acid. Some reactions of diethylamine, pyrrolidine, and aniline have been studied. Reaction of benzyl methyl ketone and diethyl malonate with buta-1,3-diene catalysed by NiCl2–Ph3P–NaBH4 yields mainly the 2 : 1 adducts. With the system CoCI2-Ph3P-NaBH4, prior formation of the sodium salt of diethyl malonate was required for reaction with buta-1,3-diene.
Palladium-catalyzed Reactions of 1,3-Dienes with Active Methylene Compounds. IV. Palladium-diphosphine Complex Catalysts
作者:Kuniyuki Takahashi、Akihisa Miyake、Go Hata
DOI:10.1246/bcsj.45.1183
日期:1972.4
Activemethylenecompounds, such as acetylacetone and ethyl acetoacetate, reacted with 1,3-butadiene in the presence of palladium-diphosphine complex catalysts to yield two 1 : 1 adducts, 1 and 2. Primary and secondary amines also afforded two 1 : 1 adducts, 10 and 11. Isoprene, 1,3-pentadiene, and 2,4-hexadiene also reacted with the activemethylenecompounds and the amines in a manner similar to
Synthesis of Secondary Amines by Titanium-Mediated Transfer of Alkenyl Groups from Alcohols
作者:Balasubramanian Ramanathan、Aaron L. Odom
DOI:10.1021/ja0628811
日期:2006.7.1
Reaction of Ti(NMe2)4 with allyl alcohols and primary amines leads to the selective formation of secondary allylic amines. The allyl transferfrom the alcohol to the amine occurs with selective allylic transposition. Due to substituent effects in the reactions, we postulate that the reaction occurs through a [2 + 2]/retro-[2 + 2]-cycloaddition mechanism. It was also found that a similar reaction could