Synthesis of 11,12-dihydro benzo[c]phenanthridines via a Pd-catalyzed unusual construction of isocoumarin ring/FeCl3-mediated intramolecular arene-allyl cyclization: First identification of a benzo[c]phenanthridine based PDE4 inhibitor
作者:B. Thirupataiah、Gangireddy Sujeevan Reddy、Shailendra S. Ghule、Jetta Sandeep Kumar、Guntipally Mounika、Kazi Amirul Hossain、Jayesh Mudgal、Jessy E. Mathew、Gautham G. Shenoy、Kishore V.L. Parsa、Manojit Pal
DOI:10.1016/j.bioorg.2020.103691
日期:2020.4
In spite of their various pharmacological properties the anti-inflammatory potential of benzo[c]phenanthridines remained underexplored. Thus, for the first time PDE4 inhibitory potential of 11,12-dihydro benzo[c]phenanthridine / benzo[c]phenanthridine was assessed in vitro. Elegant synthesis of these compounds was performed via a multi-step sequence consisting of a Pd-catalyzed unusual construction
尽管它们具有多种药理特性,但苯并[ c ]菲啶的抗炎潜力仍未得到开发。因此,首次在体外评估了11,12-二氢苯并[ c ]菲啶/苯并[ c ]菲啶的PDE4抑制潜能。这些化合物的优雅合成是通过多步骤序列完成的,该步骤由Pd催化的4-烯丙基异香豆素环和FeCl 3的异常结构组成介导的分子内区域以及位点选择性的芳烃烯丙基环化是关键步骤。总体策略涉及Sonogashira偶联,然后合成异香豆素和异喹诺酮,然后氯化并随后环化,得到一系列11,12-二氢衍生物。这些二氢化合物之一被转化为相应的苯并[ c ]菲啶,该苯并菲显示出对PDE4B的浓度依赖性抑制,从而提供了初始命中分子。SAR研究表明,11,12-二氢类似物的效力不及在环的同一部分具有不饱和键的化合物。