Convenient synthesis of acetaminophen analogues containing α-amino acids and fatty acids via their mixed carbonic carboxylic anhydrides in aqueous organic solvent
Acetaminophen analogues containing α-amino acid and fatty acids were easily synthesized in 77–99% yields from the corresponding mixed carbonic carboxylic anhydrides of α-amino acid and fatty acids using aniline derivatives in aqueous MeCN.
A practical method for the removal of a versatile acidicamide auxiliary has been developed. Facile alcoholysis of the amide in the presence of KOAc is enabled by an epoxide, which mechanistically resembles the removal of the Myers’ auxiliary. The protocol has been applied to the removal of a variety of amide substrates and their C–H functionalization products with high efficiency and low cost, representing
Amide-directed arylation of sp3 C–H bonds using Pd(II) and Pd(0) catalysts
作者:Masayuki Wasa、Jin-Quan Yu
DOI:10.1016/j.tet.2010.03.111
日期:2010.6
Protocols to effect β-arylation of sp3 C–Hbonds via Pd(II)/(IV) and Pd(0)/(II) catalytic cycles have been achieved using a newly developed monodentate CONHC6F5 directing group. These reactions provide an unprecedented means to functionalize sp3 C–Hbonds in aliphatic carboxylic acid-derived substrates.
Pd(0)/PR<sub>3</sub>-Catalyzed Intermolecular Arylation of sp<sup>3</sup> C−H Bonds
作者:Masayuki Wasa、Keary M. Engle、Jin-Quan Yu
DOI:10.1021/ja903573p
日期:2009.7.29
Pd(0)-catalyzedintermolecular arylation of sp(3) C-H bonds has been achieved using PR(3)/ArI. This protocol can be used to arylate a variety of aliphatic carboxylic acid derivatives, including a number of bioactive drug molecules. The use of fluorinated aryl iodides also allows for the introduction of fluorine into a molecule of interest.