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
AlCl3 induced C–N bond formation followed by Pd/C–Cu mediated coupling–cyclization strategy: synthesis of pyrrolo[2,3-b]quinoxalines as anticancer agents
作者:Bagineni Prasad、K. Shiva Kumar、P. Vijaya Babu、K. Anusha、D. Rambabu、Ajit Kandale、G.R. Vanaja、Arunasree M. Kalle、Manojit Pal
DOI:10.1016/j.tetlet.2012.08.119
日期:2012.11
affording a convenient method for the preparation of N-aryl substituted 3-chloroquinoxalin-2-amines. A related N-benzyl derivative, however, was prepared via a conventional method. These N-alkyl/aryl substituted 3-chloroquinoxalin-2-amines on coupling with terminal alkynes in toluene under Pd/C–Cu catalysis afforded a range of 1,2-disubstituted pyrrolo[2,3-b]quinoxalines within 3–5 h in good to excellent
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。
US9522124B2
申请人:——
公开号:US9522124B2
公开(公告)日:2016-12-20
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.