Direct Access to Allenylphosphine Oxides via a Metal Free Coupling of Propargylic Substrates with P(O)H Compounds
摘要:
A direct and convenient approach for the coupling of propargylic substrates with diphenylphosphine oxide in the presence of Tf2O and 2,6-lutidine has been developed. The method provides a general approach for the construction of attractive allenylphosphoryl skeletons with high atom and step economy under metal free conditions.
Long chain unsaturated hydrocarbon derivatives, having from 13 to 21 carbon atoms, which are substituted at the 1-position by a phenoxy, phenylthio or a phenyl that bear a carboxylic acid group at the ortho, meta or para positions, and up to 4 carbon-carbon triple bonds, methods of preparing them, and pharmaceutical preparations containing them. These compounds are useful as lipoxygenase inhibitors, and therefore as antiinflammatory agents.
Cyclopropenones for Metabolic Targeting and Sequential Bioorthogonal Labeling
作者:R. David Row、Hui-Wen Shih、Austin T. Alexander、Ryan A. Mehl、Jennifer A. Prescher
DOI:10.1021/jacs.7b03010
日期:2017.5.31
Cyclopropenones are attractive motifs for bioorthogonalchemistry, owing to their small size and unique modes of reactivity. Unfortunately, the fastest-reacting cyclopropenones are insufficiently stable for routine intracellular use. Here we report cyclopropenones with improved stability that maintain robust reactivity with bioorthogonal phosphines. Functionalized cyclopropenones were synthesized and
A method for producing a propargylamine compound represented by the general formula (I):
which comprises reacting a propargyl compound represented by the general formula (II):
with an aromatic aldehyde represented by the general formula (III):
ArCHO (III)
and ammonia to obtain an imine compound represented by the general formula (IV):
and hydrolyzing the resultant imine compound. It is to provide a method for producing a propargylamine compound from a propargyl compound by a simple operation without using a special facility, using ammonia as a reaction reagent, without producing a dipropatygylamine compound and a tripropargylamine compound as by-products.
Access to 2-Alkenyl-furans via a Cascade of Pd-Catalyzed Cyclization/Coupling Followed by Oxidative Aromatization with DDQ
作者:Bartosz Bisek、Wojciech Chaładaj
DOI:10.1021/acs.joc.4c00149
日期:2024.5.17
An unprecedented DDQ-mediated oxidative aromatization of 2-bezylidene-dihydrofurans yielding 2-alkenyl-furans is disclosed. Integration of this transformation with a prior Pd-catalyzed reaction of α-propargylic-β-ketoesters and (hetero)aryl halides into a one-pot cascade process opens a direct modular route to highly substituted 2-vinyl-furans. Experimental and computational studies reveal that the