As a continuation of our efforts directed towards the development of anti-diabetic agents from natural sources, piplartine was isolated from Piper chaba, and was found to inhibit recombinant human ALR2 with an IC50 of 160 μM. To improve the efficacy, a series of analogues have been synthesized by modification of the styryl/aromatic and heterocyclic ring functionalities of this natural product lead
olefin with an exocyclic methylene at C2 render PL analogues 47–49 with increased senolytic activity. These α-methylene containing analogues are also more potent than PL in inducing ROS production in WI-38 SCs. Similar to PL, 47–49 reduce the protein levels of oxidation resistance 1 (OXR1), an important oxidative stress response protein that regulates the expression of a variety of antioxidant enzymes
Piperlongumine derived cyclic sulfonamides (sultams): Synthesis and in vitro exploration for therapeutic potential against HeLa cancer cell lines
作者:Nitin P. Lad、Sarang Kulkarni、Rajiv Sharma、Malcolm Mascarenhas、Mahesh R. Kulkarni、Shivaji S. Pandit
DOI:10.1016/j.ejmech.2016.12.022
日期:2017.1
A novel modification of piperlongumine is designed, bearing a cyclic sulphonamide (sultam) and its synthesis is described. For the first time herein we report the synthesis and biological evaluation of the natural product derived cyclic sulfonamides using Grubbs second generation catalyst (Grubbs II) via ring closing metathesis approach. Synthesis of a series of piperlongumine derived sultams is done
Reductive Asymmetric Aza‐Mislow‐Evans Rearrangement by 1,3,2‐Diazaphospholene Catalysis**
作者:Guoting Zhang、Nicolai Cramer
DOI:10.1002/anie.202301076
日期:——
A 1,3,2-diazaphospholene-catalyzed three-step cascade transformation of chiral N-sulfinyl acrylamides comprised of a conjugate reduction, enantiospecific [2,3]-sigmatropic aza-Mislow-Evans rearrangement, and subsequent S−O bond reductive cleavage provides access to synthetically valuable enantio-enriched α-hydroxy amides. Various α-hydroxy amides are obtained in good yields and high enantioselectivities