Synthesis of Perspicamide A and Related Diverse Analogues: Their Bioevaluation as Potent Antileishmanial Agents
摘要:
The first protocol for the synthesis of perspicamide A and related diverse analogues has been developed from economical and readily available starting materials. Furthermore, a few synthesized analogues, 24a, 246, 24c, 24d, and 241, exhibited potent activity against Leishmania donovani with IC50 values ranging from 3.75 to 10.37 mu M and a selectivity index (SI) ranging from 9.58 to 53.12, which is improved compared to the standard drug Miltefosine (IC50 12.4 mu M and SI 4.1).
Hypervalent iodine(<scp>iii</scp>)-promoted N-incorporation into N-aryl vinylogous carbamates to quinoxaline diesters: access to 1,4,5,8-tetraazaphenanthrene
作者:A. Sagar、Shinde Vidaycharan、Anand H. Shinde、Duddu S. Sharada
DOI:10.1039/c6ob00447d
日期:——
A novel oxidative N-incorporation strategy for synthesis of quinoxaline diesters under metal-free conditions is described for the first time. The mild reaction conditions allow for this transformation via the formation of two C(sp2)–N bonds utilizing cheaply available NaN3 as the N-atom source. N-Aryl vinylogous carbamates in this study undergo azidation at enamino C(sp2)–H selectively. The robustness
Hydroamination Reactions of Alkynes with<i>ortho</i>-Substituted Anilines in Ball Mills: Synthesis of Benzannulated N-Heterocycles by a Cascade Reaction
electrophilic alkynes and anilines with OH, NH, or SH groups in the ortho position. For the heterocycle formation, it was shown that several stress conditions were able to initiate the reaction in the solid state. Processing in a ball mill seemed to be advantageous over comminution with mortar and pestle with respect to process control. In the latter case, significant postreaction modification occurred during
Palladium nanoparticle catalyzed synthesis of indoles via intramolecular Heck cyclisation
作者:Debasish Sarmah、Anup Choudhury、Utpal Bora
DOI:10.1039/d4ob01177e
日期:——
A system utilizing palladium(II)-PEG has been devised for the intramolecular Heck cyclization of N-vinyl and N-allyl-2-haloanilines. The synthesis of a variety of indoles, including 2,3-diester substituted ones and 3-methyl indoles, has been accomplished using this catalytic system. The N-vinyl starting materials are obtained by the aza-Michael addition of 2-haloanilines with alkynecarboxylate esters
设计了一种利用钯( II )-PEG 的系统,用于N-乙烯基和N-烯丙基-2-卤代苯胺的分子内 Heck 环化。利用该催化体系完成了多种吲哚的合成,包括2,3-二酯取代吲哚和3-甲基吲哚。 N-乙烯基起始材料通过2-卤代苯胺与炔烃羧酸酯的氮杂-迈克尔加成获得,其在环化后产生酯取代的吲哚。相反, N-烯丙基-2-卤代苯胺产生3-甲基化吲哚作为主要产物。该系统的高活性归功于Pd纳米颗粒的原位生成。