title: Benzopyrans as selective estrogen receptor beta agonists (SERBAs). Part 5: Combined A- and C-ring structure-activity relationship studies.
abstract: Benzopyrans are selective estrogen receptor (ER) beta agonists (SERBAs), which bind the ER subtypes alpha and beta in opposite orientations. Here we describe the synthesis of a late stage intermediate that allowed us to combine A-ring and C-ring modifications and carry out simultaneous SAR studies at both positions. Modification of both positions proved additive, maintaining affinity and improving ERbeta selectivity up to 83-fold. An X-ray cocrystal structure confirms the previously observed binding mode in ERbeta.
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Lilly Corporate Center, Indianapolis, IN 46285, USA. t_richardson@lilly.com
authors.forename: Timothy I
authors.initials: TI
authors.lastname: Richardson
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Dodge
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.forename: Jim D
authors.initials: JD
authors.lastname: Durbin
authors.forename: Venkatesh
authors.initials: V
authors.lastname: Krishnan
authors.forename: Bryan H
authors.initials: BH
authors.lastname: Norman
mesh_terms: D001578:Benzopyrans / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D047628:Estrogen Receptor alpha / Q000819:agonists / Q000378:metabolism; D047629:Estrogen Receptor beta / Q000819:agonists* / Q000378:metabolism*; D008958:Models, Molecular; D015394:Molecular Structure; D013329:Structure-Activity Relationship