Pd-Catalyzed α-Arylation of Trimethylsilyl Enolates of α,α-Difluoroacetamides
作者:Shaozhong Ge、Sophie I. Arlow、Michael G. Mormino、John F. Hartwig
DOI:10.1021/ja508590k
日期:2014.10.15
ilyl)acetamides with aryl and heteroaryl bromides catalyzed by an air- and moisture-stable palladacyclic complex containing P(t-Bu)2Cy as ligand. A broad range of electronically varied aryl and heteroaryl bromides underwent this transformation to afford α-aryl-α,α-difluoroacetamides in high yields. Due to the electrophilicity of the fluorinated amide, this palladium-catalyzed cross-coupling reaction
Chemoenzymatic Synthesis of Each Enantiomer of Orthogonally Protected 4,4-Difluoroglutamic Acid: A Candidate Monomer for Chiral Brønsted Acid Peptide-Based Catalysts
作者:Yang Li、Scott J. Miller
DOI:10.1021/jo2018679
日期:2011.12.2
We have accomplished an asymmetric synthesis of each enantiomer of 4,4-difluoroglutamic acid. This α-aminoacid has been of interest in medicinal chemistry circles. Key features of the synthesis include highly scalable procedures, a Reformatsky-based coupling reaction, and straightforward functional group manipulations to make the parent amino acid. Enantioenrichment derives from an enzymatic resolution
A nickel-catalyzed cross-coupling of heteroaryl halides with chlorodifluoroacetamides and chlorodifluoroacetate has been developed. The synthetic simplicity from widely available fluorine sources and heteroaryl halides renders the protocol cost efficient synthesis of biologically active molecules, providing a facile route for applications in medicinal chemistry.
Difluorinated malonaldehyde derivatives as useful difluoromethylene-containing building blocks
作者:Takashi Tsukamoto、Tomouya Kitazume
DOI:10.1039/c39920000540
日期:——
New CF2-containing building blocks, ethyl 3-ethoxy-2,2-difluoro-3-hydroxy-propionate and -propioamide, were prepared via formylation of α,α-difluorinated Reformatsky reagents, and reacted with active methylene compounds, nitromethane or phosphonoacetate to afford α,α-difluoro-functionalized esters and amides.
(R)-and (S)-N,N-Diethyl 2,2-difluoro-3-(2-furyl)-3-hydroxypropionamide 7 have been obtained via enzymicresolution of the racemic acetate using lipase MY from Candida cylindracea. Ozonolysis of the (S)-7 followed by hydrolysis afforded the (S)-β,β-difluoromalic acid 1.