Reductive Alkylation of Amines with Carboxylic Ortho Esters
作者:Renat Kadyrov、Konrad Moebus
DOI:10.1002/adsc.202000510
日期:2020.8.19
carboxylic ortho esters could be used as an alkylating agent in the reductivealkylation of amines. A variety of amines, including amino acid esters, were alkylated affording mono‐alkylated products with high selectivity in practical to high yields using standard heterogeneous catalysts. By applying acyclic ortho esters alkylation was completed at room temperature.
Imidazoquinoline and tetrahydroimidazoquinoline compounds that contain thioether functionality at the 1-position are useful as immune response modifiers. The compounds and compositions of the invention can induce the biosynthesis of various cytokines and are useful in the treatment of a variety of conditions including viral diseases and neoplastic diseases.
Nonpeptide Angiotensin II Receptor Antagonists: Synthesis, Biological Activities, and Structure−Activity Relationships of Imidazole-5-carboxylic Acids Bearing Alkyl, Alkenyl, and Hydroxyalkyl Substituents at the 4-Position and Their Related Compounds
A series of imidazole-5-carboxylic acids bearing alkyl, alkenyl, and hydroxyalkyl substituents at the 4-position and their related compounds were prepared and evaluated for their antagonistic activities to the angiotensin II (AII) receptor. Among them, the 4-(1-hydroxyalkyl)-imidazole derivatives had strong binding affinity to the AII receptor and potently inhibited the AII-induced pressor response
A Highly Effective Sulfamic Acid/Methanol Catalytic System for the Synthesis of Benzimidazole Derivatives at Room Temperature
作者:Zhan-Hui Zhang、Tong-Shuang Li、Jian-Jiong Li
DOI:10.1007/s00706-006-0566-1
日期:2007.1
Sulfamic acid/methanol was found to be an efficient catalytic system for the synthesis of benzimidazole compounds through the condensation of o -phenylenediamine with orthoester in high yields at room temperature.
Synthesis of 2-substituted benzimidazoles by iodine-mediated condensation of orthoesters with 1,2-phenylenediamines
作者:Zhan-Hui Zhang、Jian-Jiong Li、Yuan-Zhe Gao、Yu-Heng Liu
DOI:10.1002/jhet.5570440642
日期:2007.11
Iodine was found to be an efficient catalyst for the synthesis of 2-substitutedbenzimidazoles by the condensation of orthoesters and 1,2-phenylenediamines in good to excellent yields under mild reaction conditions.