Ligand-free MCR for linking quinoxaline framework with a benzimidazole nucleus: a new strategy for the identification of novel hybrid molecules as potential inducers of apoptosis
Ligand/PTC-free intramolecular Heck reaction: synthesis of pyrroloquinoxalines and their evaluation against PDE4/luciferase/oral cancer cell growth in vitro and zebrafish in vivo
作者:P. Vijaya Babu、Soumita Mukherjee、Girdhar Singh Deora、Keerthana Sarma Chennubhotla、Raghavender Medisetti、Swapna Yellanki、Pushkar Kulkarni、Shivashankar Sripelly、Kishore V. L. Parsa、Kiranam Chatti、K. Mukkanti、Manojit Pal
DOI:10.1039/c3ob41504j
日期:——
A series of 1,3-disubstituted pyrrolo[2,3-b]quinoxalines has been designed for the potential inhibition of PDE4 without inhibiting luciferase. A ligand/PTC (phase transfer catalyst) free intramolecular Heck cyclization strategy was used to prepare these compounds, some of which showed significant inhibition of PDE4B (IC50 ≈ 5–14 μM) and growth inhibition of oral cancer cells (CAL 27) but not inhibition of luciferase in vitro. They also showed acceptable safety profiles but no apoptosis in zebrafish embryos.
Using Calcium Carbide as an Acetylene Source for Cascade Synthesis of Pyrrolo[2,3-<i>b</i>
]quinoxalines <i>via</i>
Copper-Free <i>Sonogashira</i>
Coupling Reaction
A palladium‐catalyzed cascade protocol has been established for the synthesis of 4‐methyl‐1‐(1H‐pyrrolo[2,3‐b]‐quinoxalin‐2‐yl)cyclohexanols and 2‐phenyl‐1‐(1H‐pyrrolo[2,3‐b]quinoxalin‐2‐yl)propan‐1‐ols through the reaction of N‐alkyl(aryl)‐3‐chloroquinoxalin‐2‐amines with calcium carbide and cyclohexanones or 2‐phenylpropanal. This one‐pot process, carried out without any copper salt in the key step
钯催化的级联协议已建立的4-甲基-1-(1-合成ħ吡咯并[2,3- b ] -喹喔啉-2-基)环己醇和2-苯基-1-(1- ħ -吡咯并[2,3 - b ]喹喔啉-2-基)丙-1-醇通过N-烷基(芳基)-3-氯喹喔啉-2-胺与碳化钙和环己酮或2-苯基丙醛的反应而形成。此一锅法在Sonogashira偶联反应的关键步骤中不使用任何铜盐进行,提供了一种在催化量存在下合成2,3-二取代吡咯并[2,3- b ]喹喔啉的有效方法Pd(PPh 3)2 Cl 2的含量在DMSO / H 2 O中的产率很高。该策略的好处是使用市售的,廉价的和危害较小的主要化学原料碳化钙作为湿溶剂中的乙炔源。
One-pot synthesis of 1,2-disubstituted pyrrolo[2,3-b]quinoxalines via palladium-catalyzed heteroannulation in water
作者:Ali Keivanloo、Mohammad Bakherad、Amin Rahimi、Sayed Ali Naghi Taheri
DOI:10.1016/j.tetlet.2010.02.123
日期:2010.5
N-alkyl-3-chloroquinoxaline-2-amines with 1-alkynes, catalyzed by Pd–Cu, in the presence of sodium lauryl sulfate as the surfactant in water, leads to the one-pot formation of 1,2-disubstituted pyrrolo[2,3-b]quinoxalines in good-to-high yields.
在水中十二烷基硫酸钠作为表面活性剂的情况下,在钯-铜催化下,N-烷基-3-氯喹喔啉-2-胺与1-炔烃的反应导致一锅法形成1,2-双取代吡咯并[2,3- b ]喹喔啉类化合物,收率高至高。
Regioselective synthesis of 2,3-disubstituted 1-alkyl pyrrolo[2,3-b] quinoxalines through palladium-catalyzed Heck reaction of chalcones and evaluation of their anti-bacterial activities
The regioselective synthesis of 1-alkyl-2-aryl-3-acyl pyrrolo[2,3-b]quinoxalines through palladium-catalyzed Heck coupling reaction/heteroannulation was reported. The reaction of N-alkyl/benzyl-3-chloroquinoxaline-2-amines with chalcones catalyzed by Pd(OAc)2 in the presence of KOtBu, as the base, in DMSO afforded the desired products in good-to-high yields. The MIC and MBC determinations revealed
报道了通过钯催化的Heck偶联反应/杂环化反应的1-烷基-2-芳基-3-酰基吡咯并[2,3- b ]喹喔啉的区域选择性合成。的反应ñ -烷基/苄基-3-氯喹喔啉-2-胺与通过将Pd(OAC)催化查耳酮2在KO的存在吨卜,作为碱,在DMSO中,得到良好的到高的产率的期望的产物。MIC和MBC的测定表明,这些化合物可用于未来开发抗生素的研究工作中。
Novel one-pot synthesis of 1-alkyl-2-(aryloxy)methyl-1H-pyrrolo[2,3-b]quinoxalines via copper-free Sonogashira coupling reaction
efficient protocol is described for the synthesis of 1-alkyl-2-(aryloxy)methyl-1H-pyrrolo[2,3-b]quinoxalines via the one-pot reaction of phenol or 2-naphthol derivatives, propargyl bromide, and N-alkyl-3-chloroquinoxaline-2-amines in the presence of palladium catalyst. This one-pot reaction is carried out in the absence of any copper salt at room temperature. The reaction product is dependent on the nature
摘要描述了一种新颖,简单而有效的方案,用于通过苯酚或2-萘酚衍生物的一锅反应合成1-烷基-2-(芳氧基)甲基-1 H-吡咯并[2,3- b ]喹喔啉,炔丙基溴和N-烷基-3-氯喹喔啉-2-胺在钯催化剂的存在下。该一锅法反应在室温下在不存在任何铜盐的情况下进行。反应产物取决于所用碱的性质。使用吗啉作为碱,得到最终的环化产物,而三乙胺仅得到偶联产物。 图形概要