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In an effort to develop novel affinity labeling agents for the estrogen receptor, we have synthesized two nonsteroidal ligands, a 1-aroyl-2-aryl tetralin system (1) and a 2-aryl-3-aroylbenzothiophene system (2).These agents, patterned after the Lilly antiestrogens trioxifene and LY 117018, respectively, embody acyl azide functions as part of a benzoyl chromophore.The acyl azide group has weak acylating activity, suitable for electrophilic affinity labeling,but this function is also photoreactive and, in its particular embodiment within these ligands, it could provide an efficient photochemical route to the highly reactive singlet acyl nitrene.The tetralin system (1) was prepared nine steps from 6-methoxy-1-tetralone, and the benzothiophene system (2) was prepared in four steps from a known substituted benzothiophene precursor.In competitive binding assays, both compounds show reasonable binding affinity for the rat and lamb uterine estrogen receptor : estradiol = 100percent, 1 = 3percent, and 2 = 12percent.When assayed by indirect receptor consumption assays, both compounds appear to have substantial capacity for irreversible binding (electrophilic reaction) with the receptor.This reactivity, which suggests that acylation of the receptor has occurred, is photoreversible.The nature of this ligand-receptor interaction is being investigated further. keywords: estrogen receptor, affinity labeling, photoaffinity labeling, nonsteroidal estrogens, antiestrogens, steroids

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Reference:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem