Design, synthesis, and structure-activity relationships of thieno[2,3-b]pyridin-4-one derivatives as a novel class of potent, orally active, non-peptide luteinizing hormone-releasing hormone receptor antagonists.
Design, synthesis, and structure-activity relationships of thieno[2,3-b]pyridin-4-one-based non-peptide luteinizing hormone-releasing hormone (LHRH) receptor antagonists are described. Starting with the thienopyridin-4-one derivative 26d (T-98475) an optimization study was performed, which resulted in the identification of a highly potent and orally bioavailable LHRH receptor antagonist, 3-(N-benzyl-N-methylaminomethyl)-7-(2,6-difluorobenzyl)-4,7-dihydro-2-[4-(1-hydroxy-1-cyclopropanecarboxamido)phenyl]-5-isobutyryl-4-oxothieno[2,3-b]pyridine (33c). Compound 33c displayed subnanomolar in vitro activities for the human receptor and its oral administration caused effective suppression of the plasma LH levels in castrated male cynomolgus monkeys. Furthermore, SAR studies revealed that a hydroxyalkylamido moiety on the 2-phenyl ring is virtually equivalent to an alkylureido moiety, at least in this series of compounds.
Imada
Takashi
T
Medicinal Chemistry Research Laboratories and Discovery Research Center, Pharmaceutical Research Division, Takeda Pharmaceutical Company, Ltd., 17-85, Jusohonmachi 2-chome, Yodogawa-ku, Osaka 532-8686, Japan. Imada_Takashi@takeda.co.jp
Cho
Nobuo
N
Imaeda
Toshihiro
T
Hayase
Yoji
Y
Sasaki
Satoshi
S
Kasai
Shizuo
S
Harada
Masataka
M
Matsumoto
Hirokazu
H
Endo
Satoshi
S
Suzuki
Nobuhiro
N
Furuya
Shuichi
S
D000284:Administration, Oral; D000818:Animals; D016718:Arachidonic Acid / Q000378:metabolism; D016466:CHO Cells; D006224:Cricetinae; D003412:Cricetulus; D006801:Humans; D008252:Macaca fascicularis; D008297:Male; D008958:Models, Molecular; D008968:Molecular Conformation; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011728:Pyridones / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011869:Radioligand Assay; D051381:Rats; D011966:Receptors, LHRH / Q000037:antagonists & inhibitors*; D013045:Species Specificity; D013329:Structure-Activity Relationship; D013876:Thiophenes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology
C512436:3-(N-benzyl-N-methylaminomethyl)-7-(2,6-difluorobenzyl)-4,7-dihydro-2-(4-(1-hydroxy-1-cyclopropanecarboxamido)phenyl)-5-isobutyryl-4-oxothieno(2,3-b)pyridine; D011725:Pyridines; D011728:Pyridones; D011966:Receptors, LHRH; D013876:Thiophenes; D016718:Arachidonic Acid