The NHBoc group affords ortho selective C-H borylations in arenes and alkenes. Experimental and computational studies support an outer sphere mechanism where the N-H proton hydrogen bonds to a boryl ligand oxygen. The regioselectivities are unique and complement those of directed ortho metalations.
Preparation and applications of a polymer-supported phosphoryl azide
作者:Yuhua Lu、Richard T. Taylor
DOI:10.1016/j.tetlet.2003.10.066
日期:2003.12
A polymer-supported diphenylphosphoryl azide was prepared. This polymer-supported version of DPPA is useful due to its lower toxicity, moisture tolerance and ease of workup after reaction. The synthetic application of this solid-phase reagent was explored by conversion of a variety of carboxylic acids to urethanes and ureas through Curtius rearrangement reactions. Carboxylic acids bearing different
Photoredox/Cobalt Dual‐Catalyzed Decarboxylative Elimination of Carboxylic Acids: Development and Mechanistic Insight
作者:Kaitie C. Cartwright、Ebbin Joseph、Chelsea G. Comadoll、Jon A. Tunge
DOI:10.1002/chem.202001952
日期:2020.9.25
Recently, dual‐catalytic strategies towards the decarboxylative elimination of carboxylicacids have gained attention. Our lab previously reported a photoredox/cobaloxime dual catalytic method that allows the synthesis of enamides and enecarbamates directly from N‐acyl amino acids and avoids the use of any stoichiometric reagents. Further development, detailed herein, has improved upon this transformation's
Decarbonylative Approach to the Synthesis of Enamides from Amino Acids: Stereoselective Synthesis of the (<i>Z</i>)-Aminovinyl-<scp>d</scp>-Cysteine Unit of Mersacidin
作者:Pablo García-Reynaga、Angela K. Carrillo、Michael S. VanNieuwenhze
DOI:10.1021/ol203399x
日期:2012.2.17
The Pd- and Ni-promoted decarbonylation of aminoacid thioesters proceeds smoothly to yield enamides. The synthesis of the (S)-(Z)-AviMeCys subunit of mersacidin, an MRSA-active lantibiotic, via this approach, is described.
Pd 和 Ni 促进的氨基酸硫酯脱羰反应顺利进行,生成烯酰胺。描述了通过这种方法合成MRSA 活性羊毛硫抗生素 mersacidin的 ( S )-( Z )-AviMeCys 亚基。
A donor–acceptor complex enables the synthesis of <i>E</i>-olefins from alcohols, amines and carboxylic acids
Olefins are prevalent substrates and functionalities. The synthesis of olefins from readily available starting materials such as alcohols, amines and carboxylic acids is of great significance to address the sustainability concerns in organic synthesis. Metallaphotoredox-catalyzed defunctionalizations were reported to achieve such transformations under mild conditions. However, all these valuable strategies
Enamides Accessed from Aminothioesters via a Pd(0)-Catalyzed Decarbonylative/β-Hydride Elimination Sequence
作者:Geanna K. Min、Dácil Hernández、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1021/ol101620r
日期:2010.11.5
A facile synthesis of various enamides from aminothioesters via a palladium(0)-catalyzed decarbonylation/β-hydride elimination is reported. This protocol was applied to mercaptopyridyl C-terminal modified peptides for the generation of enamides without epimerization at stereogenic centers.