Takano R, Tanaka R, Nakamura K, Tabata H, Oshitari T, Natsugari H, Takahashi H. Stereochemical properties of quazepam and its affinity for the GABA
A receptor.
Bioorg Med Chem Lett 2024;
110:129854. [PMID:
38914347 DOI:
10.1016/j.bmcl.2024.129854]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 06/11/2024] [Accepted: 06/19/2024] [Indexed: 06/26/2024]
Abstract
C9-methylated quazepam 1 was prepared, and its physicochemical properties were investigated. The atropisomers of 1 were isolated as (a1R, a2S) and (a1S, a2R) isomers. Their absolute configurations were determined based on ECD spectra in comparison with those calculated using the time-dependent density functional theory. Preliminary examination of affinity for the GABAA receptor revealed that the (a1R, a2S) isomer of 1 possessed higher activity than its antipode (a1S, a2R) isomer. The active configuration of C9-methylated quazepam 1 is the same as that of 1,4-benzodiazepin-2-ones.
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