Constrained phytoestrogens and analogues as ERβ selective ligands
摘要:
A new series of ERbeta (ERbeta) selective ligands has been prepared. One of the compounds 6, structurally related to the phytoestrogen apigenin 4, displays a binding preference for ERbeta over ERalpha of over 40-fold. In addition to its binding selectivity, 6 was able to potently induce metallothionein (an ERbeta specific response in human SAOS-2 cells) while demonstrating low potency in an ERalpha dependant ERE-tk luciferase assay in MCF-7 cells. Such receptor and cell selectivity could make 6 a useful molecular probe for better understanding the role of ERbeta in mammalian physiology. (C) 2003 Elsevier Science Ltd. All rights reserved.
A highly efficient, one-pot synthesis of benzo[b]fluoren-10-ones
摘要:
5,[1-Dioxa- and 5-oxa-1]-thiabenzo[b]fluoren-10-ones were prepared via a one-pot procedure initiated by the reaction of salicylates or thiasalicylates with ortho fluoro-alpha -bromoacetophenones in the presence of cesium carbonate. The reactions proceeded in good yield and the final products were obtained without chromatography. The reaction presumably proceeds via a sequential intermolecular alkylation, intramolecular acylation sequence concluded by an intramolecular, ipso-fluoro substitution. (C) 2001 Elsevier Science Ltd. All rights reserved.