excellent yields. It was found that the choice of solvent, olefin, additive and temperature has an important influence on the reaction. Worthy of note is that good results were observed only when using N,N-diprotected allylamines containing carbamate moiety, and the steric properties of allylamines also have important impacts on the regiocontrol. The use of TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) or HQ
and regioselective palladium‐catalyzed Heck coupling of aryl bromides with electron‐rich allylamine derivatives is described. It was found that the choice of solvent, olefin, ligand and additive had a fundamental influence on the regioselectivity and reactivity of the reaction. The combination of palladium acetate [Pd(OAc)2] and 1,3‐bis(diphenylphosphino)propane (dppp) in ethylene glycol (EG) constitutes
Functionalized benzophenone, thiophene, pyridine, and fluorene thiosemicarbazone derivatives as inhibitors of cathepsin L
作者:G.D. Kishore Kumar、Gustavo E. Chavarria、Amanda K. Charlton-Sevcik、Grace Kim Yoo、Jiangli Song、Tracy E. Strecker、Bronwyn G. Siim、David J. Chaplin、Mary Lynn Trawick、Kevin G. Pinney
DOI:10.1016/j.bmcl.2010.09.026
日期:2010.11
of thiosemicarbazone analogs based on the benzophenone, thiophene, pyridine, and fluorene molecular frameworks has been prepared by chemical synthesis and evaluated as small-molecule inhibitors of the cysteine proteases cathepsin L and cathepsinB. The two most potent inhibitors of cathepsin L in this series (IC50 <135 nM) are brominated-benzophenone thiosemicarbazone analogs that are further functionalized
Cross‐Coupling of Secondary Amides with Tertiary Amides: The Use of Tertiary Amides as Surrogates of Alkyl Carbanions for Ketone Synthesis
作者:Shu‐Ren Wang、Pei‐Qiang Huang
DOI:10.1002/cjoc.201900215
日期:2019.9
has been made in the field of direct transformation of amides, nevertheless, the condensation between two amides remains rare and restricted to homo‐coupling reactions. Herein, we report the cross‐coupling of secondary amides with tertiary amides, which provides a synthesis of ketones under mild conditions, and features the use of tertiary amides as surrogates of alkyl carbanions. The method relies on