接近所有异构体:使用羧酸铑 (II) 催化剂可从邻位取代芳基叠氮化物中轻松获得一系列 α-、β- 和 δ-咔啉鎓离子(参见方案)。咔啉离子很容易被还原以提供色氨酸或去质子化以获取吡啶并吲哚。这种 [Rh II 2 ]-催化的 C H 键胺化用于合成 (±)-horsfiline 和新隐碱。esp=α,α,α',α'-四甲基-1,3-苯二丙酸酯。
6-Trifluoromethyl-Phenanthridines through Radical Trifluoromethylation of Isonitriles
作者:Bo Zhang、Christian Mück-Lichtenfeld、Constantin Gabriel Daniliuc、Armido Studer
DOI:10.1002/anie.201306082
日期:2013.10.4
A radical approach toward 6‐perfluoroalkylphenanthridines employs the Togni reagent or derivatives thereof as radical precursors and occurs in the absence of a transition metal. Bu4NI is applied as radical initiator and phenanthridines are formed in good to excellent yields. In contrast to the currently intensively investigated trifluoromethylation of arenes, the arene core is formed during the trifluoromethylation
Synthesis and evaluation of imidazole-4,5- and pyrazine-2,3-dicarboxamides targeting dengue and yellow fever virus
作者:Milind Saudi、Joanna Zmurko、Suzanne Kaptein、Jef Rozenski、Johan Neyts、Arthur Van Aerschot
DOI:10.1016/j.ejmech.2014.09.062
日期:2014.11
The results of a high-throughput screening assay using the dengue virus-2 replicon showed that the imidazole 4,5-dicarboxamide (I45DC) derivative (15a) has a high dengue virus inhibitory activity. Based on 15a as a lead compound, a novel class of both disubstituted I45DCs and the resembling pyrazine 2,3-dicarboxamides (P23DC5) were synthesized. Here, we report on their in vitro inhibitory activity against dengue virus (DENV) and yellow fever virus (YFV). Some of these first generation compounds have shown activity against both viruses in the micromolar range. Within this series, compound 15b was observed to display the highest antiviral potency against YFV with an EC50 = 1.85 mu M. In addition, compounds 20a and 20b both potently inhibited replication of DENV (EC50 = 0.93 mu M) in Vero cells. (c) 2014 The Authors. Published by Elsevier Masson SAS.