A new catalytic method for the direct alkylation of allylic C(sp3)–H bonds from unactivated alkenes via synergistic organo- and photoredoxcatalysis is described. The transformation achieves an efficient, redox-neutral synthesis of homoallylamines with broad functional group tolerance, under very mild reaction conditions. Mechanistic investigations indicate that the reaction proceeds through the N-centered
Selective Radical–Radical Cross-Couplings: Design of a Formal β-Mannich Reaction
作者:Jenna L. Jeffrey、Filip R. Petronijević、David W. C. MacMillan
DOI:10.1021/jacs.5b05376
日期:2015.7.8
organocatalysis. Transient β-enaminyl radicals derived from ketones via enamine and oxidative photoredox catalysis readily combine with persistent α-amino radicals in a highly selective hetero radical-radical coupling. This novel pathway to γ-aminoketones is predicated upon the use of DABCO as both a base and an electron transfer agent. This protocol also formally allows for the direct synthesis of
Nematic to smectic texture transformation in MBBA by in situ synthesis of silver nanoparticles
作者:P. K. Sudhadevi Antharjanam、Edamana Prasad
DOI:10.1039/b909428h
日期:——
The present study describes the texture changes in ‘nematic’ N-(4-methoxybenzylidene)-4-butylaniline (MBBA) by in situ synthesis of silver nanoparticles in the system without any external reducing or stabilizing agents. Optical polarizing microscopy (OPM), differential scanning calorimetry (DSC), nuclearmagneticresonance (NMR) spectroscopy, Fourier-transform infrared (FT-IR) spectroscopy, and scanning
transformations. We describe the development of excited-state palladium-catalyzed reductive alkylation of imines with alkyl bromides. The new methodology shows broad functional group tolerance and can additionally be applied in the direct three-component reaction of aldehydes, anilines, and alkyl bromides to give the alkyl amines under mild reaction conditions. Time-resolved photoluminescence experiments
Regioselective Synthesis of γ-Amino Esters, Nitriles, Sulfones, and Pyrrolidinones by Nickel-Catalyzed Reductive Coupling of Aldimines and Activated Alkenes