In a previous paper, we reported the N-hydroxyformamidine derivative HET0016 as a potent and selective 20-HETE synthase inhibitor. Despite its attraction as a potential therapeutic agent for cerebral diseases, the preparation of an injectable formulation of HET0016 was limited by its poor solubility under neutral conditions and instability under acidic conditions. The instability of HET0016 in acidic conditions is due to the N-hydroxyformamidine moiety, which is considered to be essential for the potent and selective activity seen in our previous study. The activity was maintained when the N-hydroxyformamidine moiety was replaced by an imidazole ring (3a; IC50 = 5.7 +/- 1.0 nM), but this was associated with a loss of selectivity for cytochrome P450s (CYPs). However, other azole derivatives such as isoxazole derivative 23 (IC50 value 38 +/- 10 nM) and pyrazole derivative 24 (IC50 value 23 +/- 12 nM) showed potent and selective activities with improved stability.
ROHMANN; MEISEL, Archiv der Pharmazie, 1961, vol. 294 /66, p. 538 - 549
作者:ROHMANN、MEISEL
DOI:——
日期:——
Organocatalytic Enantioselective (4+2) Annulation of Cyclopropane Carbaldehydes with 2‐Mercapto‐1‐Arylethanones
Here, we report the organocatalytic enantioselective synthesis of dihydrothiopyran derivatives from trans racemic donor-acceptor cyclopropane carbaldehydes (DACCs) and 2-mercapto-1-arylethanone via formal thio (4+2) cycloaddition involving thia-Michael aldol condensation and annulation. Mechanistic studies indicate a typical kinetic resolution (KR) is involved in this transformation, which results