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Potent nonsteroidal progesterone receptor agonists: synthesis and SAR study of 6-aryl benzoxazines
Puwen Zhang1, Eugene A Terefenko, Andrew Fensome
1Medicinal Chemistry I, Chemical Sciences, Wyeth Research, 500 Arcola Road, Collegeville, PA 19426, USA. zhangp@war.wyeth.com
Abstract:
Novel 6-aryl benzoxazines were prepared and examined as progesterone receptor (PR) modulators. In contrast to the structurally related 6-aryl dihydroquinoline PR antagonists, the 6-aryl benzoxazines were potent PR agonists. Compounds 4e, 5b, and 6a with the 2,4,4-trimethyl-1,4-dihydro-2H-benzo[d][1,3]oxazine core were the most potent PR agonists in the series with sub-nanomolar activities (EC(50) 0.20-0.35nM). Compound 6a was more potent than progesterone (P4) in the in vivo decidualization assay in an ovariectomized female rat model by subcutaneous administration with an ED(50) of 1.5mg/kg (vs 5.62mg/kg for P4).
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