Formylchromone derivatives as a novel class of protein tyrosine phosphatase 1B inhibitors
摘要:
Formylchromone inhibits a human protein tyrosine phosphatase PTP1B with a IC50 value of 73 muM. The chemical reactivity of formylchromone was adjusted by substitution at various positions of the formylchromone skeleton. In an initial assessment of the structure-activity relationship, the most potent inhibitor showed an IC50 of 4.3 muM against PTP1B and strong or medium selectivity against other human PTPases, LAR and TC-PTP. This compound, however, was not selective against microbial PTPases. YPTP1 and YOP. The potency and selectivity of the formylchromone derivatives expecting further improvements provides a novel pharmacophore for the design of drugs for the treatmenrt of type 2 diabetes and obesity. (C) 2003 Elsevier Ltd. All rights reserved.
Eco-friendly organocatalyst- and reagent-controlled selective construction of diverse and multifunctionalized 2-hydroxybenzophenone frameworks for potent UV-A/B filters by cascade benzannulation
作者:Muhammad Saeed Akhtar、Raju S. Thombal、Ramuel John Inductivo Tamargo、Won-Guen Yang、Sung Hong Kim、Yong Rok Lee
DOI:10.1039/d0gc01011a
日期:——
2-hydroxy-3′-formylbenzophenones and [4 + 2] cycloaddition for 2-hydroxybenzophenones. With this methodology, an unprecedented double benzannulation allows one-pot construction of diverse 7-(2′-hydroxybenzoyl)-2-naphthaldehydes via [3 + 3 + 4] cycloaddition. This protocol features a broad substrate scope, high functional-group tolerance, and operational simplicity in an environmentally benign green solvent
Construction of Halofunctionalized Indenes via a Cascade Prins‐Nazarov Cyclization Promoted by Dual Roles of BX
<sub>3</sub>
作者:Sabera Sultana、Yong Rok Lee
DOI:10.1002/adsc.201901266
日期:2020.2.21
carboxaldehydes and borontrihalides (BX3, X=F, Cl, Br, I) is described. A diverse array of halofunctionalized indenes substituted with a heterocycle has been synthesized regioselectively with BX3 as a promotor for the carbocyclization and a source of X− for halogenation. This reaction proceeds via a formal halogenative [4+1] cycloaddition between arylalkynes and carboxaldehydes promoted by borontrihalides to generate
A Brønsted acid controlled Diels-Alder reaction of 3-vinylchromones with arynes has been developed. By employing different kinds and amounts of acid, 9-aryl-9H-xanthen-9-ols or ortho-hydroxybenzophenones could be controllably furnished in good yields in an atom- and step-economic manner.
A catalyst- and solvent-free thermal multicomponent approach for the construction of diverse and polysubstituted 2-aminopyridines and their antibacterial activity
作者:Ek Raj Baral、Kavita Sharma、Muhammad Saeed Akhtar、Yong Rok Lee
DOI:10.1039/c6ob02015a
日期:——
efficient and facile thermal multicomponent cascade reaction of readily available 4-oxo-4H-chromene-3-carbaldehydes with cyanoacetates or cyanoamides and anilines or aliphatic amines under solvent and catalyst-free conditions was developed for the synthesis of a range of polysubstituted 2-aminopyridine derivatives in good to excellent yield. This protocol proceeds via a cascade reaction of Knoevenagel condensation
Original Mitsunobu-Triggered Sequence Involved in a One-Pot Domino Process toward Tetracyclic Systems Bearing a Bis-<i>N</i>,<i>O</i>-acetal Junction
作者:Thomas Lepitre、Clement Denhez、Morgane Sanselme、Mohamed Othman、Ata Martin Lawson、Adam Daïch
DOI:10.1021/acs.joc.6b01523
日期:2016.10.7
Herein is reported an efficient, one-pot dominoprocess through a 1,6-aza-Michael addition-triggered sequence and an original Mitsunobu-type concerted sequence for the synthesis of tetracyclic systems containing a bis-N,O-acetal junction. This methodology led to the construction of four new bonds, the cleavage of three C–O bonds, and the generation of an asymmetric center. Mitsunobu activation afforded