Novel 3-phenylprop-2-ynylamines as inhibitors of mammalian squalene epoxidaseElectronic supplementary information (ESI) available: Proton NMR spectra for the intermediate piperidines 56–60 and acetylenes 63-81 and 85,86. See http://www.rsc.org/suppdata/ob/b2/b209165h/
Synthesis of 2-Amino-6-phenyl-4<i>H</i>-pyran-4-ones
作者:Joel Morris、Donn G. Wishka
DOI:10.1055/s-1994-25402
日期:——
The treatment of a series of phenylacetylenic ß-keto amides with methanesulfonic acid produces a high yielding intramolecular cyclization to the corresponding 2-amino-6-phenyl-4H-pyran-4-ones.
Exploring Skeletal Diversity via Ring Contraction of Glycal-Derived Scaffolds
作者:Adam R. Yeager、Geanna K. Min、John A. Porco,、Scott E. Schaus
DOI:10.1021/ol0618252
日期:2006.10.1
Arylether C-glycoside scaffolds have been prepared from tri-O-acetyl-D-glucal by C-glycosylation followed by allylic substitution with phenols mediated by Pd(0). The arylethers were subjected to either [3,3]-sigmatropic rearrangement to produce 3-pyranyl-phenols or Au(III)-mediated ring contraction to create highly substituted tetrahydrofurans. [structure: see text]
PEG-grafted nitrogen ligands were synthesized. The corresponding copper complexes serve as metallomicellar nanoreactors for the aerobic tandem desilylation/Glaser coupling of TMS-protected alkynes in water. The protocol is also suitable for base-free homocoupling of terminal alkynes. The metallomicellar catalyst could be recycled 5 times with minor loss of reactivity.
Stereoselective Formal Hydroamidation of Si-Substituted Arylacetylenes with DIBAL-H and Isocyanates: Synthesis of (<i>E</i>)- and (<i>Z</i>)-α-Silyl-α,β-unsaturated Amides
stereoselective method for the synthesis of (E)- and (Z)-α-silyl-α,β-unsaturatedamides and its synthetic applications are presented herein. The solvent-controlled hydroaluminations of Si-substituted alkynes with DIBAL-H generate diastereomerically enriched alkenylaluminum reagents that are directly reacted with isocyanates at ambient temperature to afford α-silyl-α,β-unsaturatedamides in high yields with retained
A green and efficient iridium-catalyzed asymmetric transfer hydrogenation of alkynyl ketones to chiral propargylic alcohols has been developed. By using sodium formate and ethanol as hydrogensources, a series of alkynyl ketones were hydrogenated by chiral spiro iridium catalyst (S)-1b to provide optically active chiral propargylic alcohols with up to 98% ee under base-free conditions. This protocol