合成了2-氨基-1H-苯并咪唑(3)和1,2-二氢-2-亚氨基环庚咪唑(4),并评估了其抗炎和镇痛活性。系列3的化合物是通过苯硫脲(6)或2-氯-1H-苯并咪唑(12)合成的。4种化合物中的大多数是通过两种方法合成的。一种是碳二亚胺(14)与2-氨基-2,4,6-环庚三烯-1-酮(方法A)的反应。另一个是胍(15)与2-氯-2,4,6-环庚三烯-1-酮(方法B)的反应。与时加定(1)或盐酸替拉酰胺(HCl)(17)相比,某些化合物3和4具有较强的抗炎和镇痛作用。有趣的是1-(2-苯并噻唑基)-2-环己基氨基-1,2-二氢环庚咪唑(4e)的镇痛活性优于timegadine或tiaramide HCl(ED50 = 1.7 mg / kg po
Electrochemical Synthesis of Carbodiimides via Metal/Oxidant-Free Oxidative Cross-Coupling of Amines and Isocyanides
作者:Bhanwar Kumar Malviya、Pradeep K. Jaiswal、Ved Prakash Verma、Satpal Singh Badsara、Siddharth Sharma
DOI:10.1021/acs.orglett.0c00510
日期:2020.3.20
This work discloses an electrochemical oxidative cross-coupling of amines with aryl and aliphatic isocyanides. In an undivided cell, the reaction proceeds without involving any transition-metal catalyst, oxidant, or toxic reagents providing carbodiimides in good yields, thereby circumventing stoichiometric chemical oxidants, with H2 as the only byproduct. Moreover, carbodiimides were in situ converted
N,N-Dialkylcarbodiimide synthesis by palladium-catalysed coupling of amines with isonitriles
作者:Ilan Pri-Bar、Jeffrey Schwartz
DOI:10.1039/a606012i
日期:——
Catalytic condensation of amines and isonitriles can be accomplished
efficiently at 100 °C using a palladium complex catalyst, oxygen, and
iodine to give N,N-dialkylcarbodiimides.
Highly α-Selective Synthesis of Sialyl Spirohydantoins by Regiospecific Domino Condensation/O→N Acyl Migration/N-Sialylation of Carbodiimides with Peracetylated Sialic Acid
作者:Dengyou Zhang、Deju Ye、Enguang Feng、Jinfang Wang、Jianmei Shi、Hualiang Jiang、Hong Liu
DOI:10.1021/jo100016k
日期:2010.6.4
A novel and efficient process for the synthesis of α-sialyl spirohydantoin analogues via one-pot sequential reaction involving various carbodiimides and peracetylated Neu5Ac is reported. BF3·Et2O mediating intramolecular N-sialylation with excellent α-selectivity is first demonstrated.
Highly Enantioselective Synthesis of 1,3-Oxazolidin-2-imine Derivatives by Asymmetric Cycloaddition Reactions of Vinyloxiranes with Unsymmetrical Carbodiimides Catalyzed by Palladium(0) Complexes
作者:Chitchamai Larksarp、Howard Alper
DOI:10.1021/jo9804341
日期:1998.9.1
4-Vinyl-1,3-oxazoilidin-2-imine derivatives have been synthesized by cycloaddition reactions of 2-vinyloxiranes with unsymmetrical carbodiimides catalyzed by palladium(0) complexes-in excellent total isolated yields. After reaction two compounds were always formed, one of which was isolated as the major product. A bulky alkyl group on one of the nitrogen atoms of the carbodiimide enhanced the product ratio in favor of the N-aryl-3-alkyl-1,3-oxazolidin-2-imine. Highly enantioselective cycloadducts (up to >99% ee) were formed by using TolBINAP as the chiral phosphine ligand, in THF at ambient temperatures. The enantiodetermination is believed to be dependent on nucleophilic attack of the anionic nitrogen of the carbodiimide due to the steric interaction of the carbodiimide substituents with the chiral phosphine ligand.