Isamu Sugimoto

Discovery of novel N-acylsulfonamide analogs as potent and selective EP3 receptor antagonists

A series of novel N-acylsulfonamide analogs were synthesized and evaluated for their binding affinity and antagonist activity for the EP3 receptor subtype. Representative compounds were also evaluated for their inhibitory effect on PGE(2)-induced uterine contraction in pregnant rats. Among those tested, a series of N-acylbenzenesulfonamide analogs were found to be more potent than the corresponding carboxylic acid analogs in both the in vitro and in vivo evaluations. The structure activity relationships (SAR) are also discussed.

Discovery of a series of acrylic acids and their derivatives as chemical leads for selective EP3 receptor antagonists

A series of acrylic acids and their structurally related compounds were evaluated for their binding affinity to four EP receptor subtypes (EP1-4). Starting from the initial hit 3, which was discovered in our in-house library, compounds 4 and 5 were identified as new chemical leads as candidates for further optimization towards a selective EP3 receptor antagonist. The identification process of these compounds and their pharmacokinetic profiles are presented.

Pyrrolo[1,2-b]pyridazines, pyrrolo[2,1-f]triazin-4(3H)-ones, and related compounds as novel corticotropin-releasing factor 1 (CRF1) receptor antagonists

To identify structurally novel corticotropin-releasing factor 1 (CRF(1)) receptor antagonists, a series of bicyclic core analogs pyrrolo[1,2-b]pyridazines and pyrrolo[2,1-f]triazin-4(3H)-ones, which were designed based on a monocyclic core antagonist, was synthesized and evaluated. Among the compounds tested, 2-difluoromethoxy-4-methylpyridin-5-yl analog 27 was found to show efficacy in a dose-dependent manner in an elevated plus maze test in rats. The discovery process and structure-activity relationship is presented.

Nucleosides and Nucleotides. Part 206: Introduction of Lipophilic Groups into 4′α-C-(2-Aminoethyl)thymidine-Containing Phosphodiester Oligodeoxynucleotides and Thermal Stabilities of the Duplexes ☆

Abstract Synthesis and properties of the 4′α- C -(2-aminoethyl)thymidine ( 1 )-containing oligodeoxynucleotides (ODNs), which have lipophilic groups such as palmitic acid, oleic acid, and cholesterol at the terminal of the aminoethyl linker of the compound 1 , are described. The ODNs were synthesized in a DNA synthesizer by using controlled pore glasses (CPGs) having the 4′α- C -[ N -(palmitoyl), N -(oleoyl), and N -(cholesteryloxycarbonyl)aminoethyl]thymidine analogs ( 9a , b , and c ). The stability of the duplexes formed by these ODNs and a complementary DNA 15 or RNA 16 was studied by thermal denaturation. It was found that the bulky functional group such as cholesterol thermally destabilizes the DNA/DNA duplexes, but that such thermal destabilization can be offset by the effects of the aminoethyl linker of 1 . Furthermore, these lipophilic groups do not largely influence the thermal stability of the DNA/RNA duplexes.

Discovery of Novel Seven-Membered Prostacyclin Analogues as Potent and Selective Prostaglandin FP and EP3 Dual Agonists

A novel series of prostaglandin analogues with a seven-membered ring scaffold was designed, synthesized, and evaluated for the functional activation of prostaglandin receptors to identify potent and subtype-selective FP and EP3 dual agonists. Starting from the prostacyclin derivative 5b, a nonselective agonist for prostaglandin receptors, replacement of the core structure with an octahydro-2H-cyclopenta[b]oxepine scaffold led to the discovery of the potent and selective FP and EP3 dual agonist 11b as a lead compound for the development of an antiglaucoma agent.