Alkene homologation <i>via</i> visible light promoted hydrophosphination using triphenylphosphonium triflate
作者:Vitalij V. Levin、Alexander D. Dilman
DOI:10.1039/d0cc07025d
日期:——
A hydrophosphination reaction of alkenes with triphenylphosphonium triflate under photocatalytic conditions is described. The reaction is promoted by naphthalene-fused N-acylbenzimidazole and is believed to proceed through intermediate formation of a phosphinyl radical cation. The resulting phosphonium salts are directly involved in the Wittig reactionleading to homologated alkenes.
Photocatalytic Barbier reaction – visible-light induced allylation and benzylation of aldehydes and ketones
作者:Anna Lucia Berger、Karsten Donabauer、Burkhard König
DOI:10.1039/c8sc02038h
日期:——
We report a photocatalytic version of the Barbier type reaction using readily available allyl or benzyl bromides and aromatic aldehydes or ketones as starting materials to generate allylic or benzylic alcohols. The reaction proceeds at room temperature under visible light irradiation with the organic dye 3,7-di(4-biphenyl)1-naphthalene-10-phenoxazine as a photocatalyst and DIPEA as sacrificial electron
quinolines with styrenes and that of a C5Me4H-ligated yttrium catalyst Y-2 for the reaction with aliphatic olefins exclusively afforded the corresponding C8-H alkylation products, thus constituting the first example of direct C8‒H alkylation of neutral quinolines. In contrast, the Sc-3-catalyzed reaction of 2-aryl quinolines with aliphatic olefins and the Y-2-catalyzed reaction with styrenes selective-ly
Carbanions. 17. Rearrangements of 2,2-diphenyl-4-pentenyl alkali metal compounds
作者:Erling Grovenstein、Auburn B. Cottingham
DOI:10.1021/ja00448a032
日期:1977.3
Flexible and biomimetic analogs of triple uptake inhibitor 4-((((3S,6S)-6-benzhydryltetrahydro-2H-pyran-3-yl)amino)methyl)phenol: Synthesis, biological characterization, and development of a pharmacophore model
and the N-benzyl group as well as the orientation of the secondary nitrogen were also important for TUI activity. We have validated our findings by synthesizing and testing novel asymmetric pyran analogs. The present work has also resulted in the discovery of a new series of asymmetric tetrahydrofuran derivatives as novel TUIs. Lead compounds 41 and 42 exhibited moderate TUI activity. Interestingly