<i>N</i>-Carboxyanhydrides directly from amino acids and carbon dioxide and their tandem reactions to therapeutic alkaloids
作者:Thi V. Tran、Yi Shen、Hieu D. Nguyen、Shijie Deng、Hootan Roshandel、Mason M. Cooper、Jose R. Watson、Jeffery A. Byers、Paula L. Diaconescu、Loi H. Do
DOI:10.1039/d2gc03507c
日期:——
versatile N-carboxyanhydrides (NCAs) directly from amino acids and CO2 using n-propylphosphonic anhydride. Most of the NCAs were isolated with >95% purity after simple workup, avoiding the need for tedious purification procedures typically required using conventional methods. Because the reagents and conditions employed are mild, tandem reactions with moisture-sensitive NCAs were carried out to transform
DMAP-Catalyzed Domino Reactions of α-Chloroaldoxime O-Methanesulfonates and 2-Aminobenzoic Acids for the Synthesis of Quinazolinediones
作者:Juthanat Kaeobamrung、Watcharadet Kaewman
DOI:10.1055/a-2107-5653
日期:2023.10
α-chloroaldoxime O-methanesulfonates via DMAP-catalyzed domino reactions under mild reaction conditions in one-pot fashion. Chemical transformations involved nucleophilic substitution, Tiemann rearrangement, and cyclic urea formation. The strength of nitrogennucleophile of 2-aminobenzoic acids and the high level of carbon electrophile of α-chloroaldoxime O-methanesulfonates were crucial for the reaction
Regioselective Copper-Catalyzed C-N and C-S Bond Formation Using Amines, Thiols and Halobenzoic Acids
作者:Christian Wolf、Shuanglong Liu、John Pestano
DOI:10.1055/s-2007-990875
日期:2007.11
Cu/Cu(2)O-catalyzed reaction is carried out in 2-ethoxyethanol or ethylene glycol diethyl ether and does not require the use of strong base or other additives. This procedure eliminates the need for acid protection, tolerates a wide range of functional groups and provides aromatic and aliphatic amines and sulfides in 81 to 99% yield.