Design, Synthesis, and Evaluation of 2-(arylsulfonyl)oxiranes as Cell-permeable Covalent Inhibitors of Protein Tyrosine Phosphatases
摘要:
A structure‐based design approach has been applied to develop 2‐(arylsulfonyl)oxiranes as potential covalent inhibitors of protein tyrosine phosphatases. A detailed kinetic analysis of inactivation by these covalent inhibitors reveals that this class of compounds inhibits a panel of protein tyrosine phosphatases in a time‐ and dose‐dependent manner, consistent with the covalent modification of the enzyme active site. An inactivation experiment in the presence of sodium arsenate, a known competitive inhibitor of protein tyrosine phosphatase, indicated that these inhibitors were active site bound. This finding is consistent with the mass spectrometric analysis of the covalently modified protein tyrosine phosphatase enzyme. Additional experiments indicated that these compounds remained inert toward other classes of arylphosphate‐hydrolyzing enzymes, and alkaline and acid phosphatases. Cell‐based experiments with human A549 lung cancer cell lines indicated that 2‐(phenylsulfonyl)oxirane (1) caused an increase in intracellular pTyr levels in a dose‐dependent manner thereby suggesting its cell‐permeable nature. Taken together, the newly identified 2‐(arylsulfonyl)oxiranyl moiety could serve as a novel chemotype for the development of activity‐based probes and therapeutic agents against protein tyrosine phosphatase superfamily of enzymes.
Metal-free visible-light-promoted C(sp<sup>3</sup>)–H functionalization of aliphatic cyclic ethers using trace O<sub>2</sub>
作者:Ben Niu、Bryan G. Blackburn、Krishnakumar Sachidanandan、Maria Victoria Cooke、Sébastien Laulhé
DOI:10.1039/d1gc03482k
日期:——
Presented is a light-promoted C–C bond forming reaction yielding sulfone and phosphate derivatives at room temperature in the absence of metals or photoredox catalyst. This transformation proceeds in neat conditions through an auto-oxidationmechanism which is maintained through the leaching of trace amounts of O2 as sole green oxidant.
Safe and Metal-Free Synthesis of 1-Alkenyl Aryl Sulfides and Their Sulfones from Thiiranes and Diaryliodonium Salts
作者:Jiaxi Xu、Jun Dong
DOI:10.1055/s-0036-1591559
日期:2018.6
These sulfides were further oxidized with performic acid to the corresponding sulfones. The current method provides a metal-free and safe method for the preparation of 1-alkenyl aryl sulfides and their sulfones. A series of 1-alkenyl aryl sulfides was synthesized from thiiranes and diaryliodonium salts in tetrahydrofuran in the presence of potassium tert-butoxide. The proposed reaction mechanism involves
A Novel Phase - Transfer Catalysed Cycloaddition of Carbonyl-Stabilized Sulfur Ylides to Vinylic Sulfones
作者:D. Bhaskar Reddy、P. S. Reddy、B. V. Reddy、P. A. Reddy
DOI:10.1055/s-1987-27854
日期:——
In our current studies on the chemistry and synthetic utility of carbonyl stabilized sulfur ylides, we have found that the cyloaddition of dimethylsulfonium phenacylides to aryl vinyl sulfones to be useful general approach to 1-arylsulfonyl-2-aroylcyclopropanes 3.
In Situ Generation of Unstable Difluoromethylphosphonate-Containing Diazoalkanes and Their Use in [3 + 2] Cycloaddition Reactions with Vinyl Sulfones
作者:Haibo Mei、Li Wang、Romana Pajkert、Qian Wang、Jingcheng Xu、Jiang Liu、Gerd-Volker Röschenthaler、Jianlin Han
DOI:10.1021/acs.orglett.1c00150
日期:2021.2.5
diazoalkanes with vinyl sulfones under simple reaction conditions is developed, which provides an efficient route toward functionalized fluorinated pyrazolines derivatives in good chemical yields. The difluoro diazoalkanes are generated in situ using t-BuONO for the diazotization of (β-amino-α,α-difluoroethyl)phosphonates, and their stabilities and reactivities were carefully investigated.