Molecular requirements of the recognition site of cholinergic receptors. 27. Enantioselectivity of muscarinic antagonists. 2,2-Dicyclohexyl-5-[(dimethylamino)methyl]-1,3-oxathiolane methiodides and related 3-oxides
摘要:
The enantiomers of three chiral muscarinic antagonists carrying a 1,3-oxathiolane nucleus were prepared and their absolute configuration established. The enantioselectivity and tissue selectivity of such compounds were studied on rat bladder and guinea pig ileum and heart. The results show that introduction of a sulfoxide function brings about a small but definite enantioselectivity in the 1,3-oxathiolane compound (2), which in itself does not show enantioselectivity among the tissues studied. The results obtained point to differences among cardiac and ileal muscarinic receptors. Comparison of the absolute configuration related agonists shows that the most potent isomers of both series share the same absolute stereochemistry.
Molecular requirements of the recognition site of cholinergic receptors. 22. Resolution, absolute configuration, and cholinergic enantioselectivity of (+)- and (-)-cis-2-methyl-5-[(dimethylamino)methyl]-1,3-oxathiolane methiodide
The potent cholinergic agonist (+/-)-cis-2-methyl-5-[(dimethylamino)methyl]-1,3-oxathiolane methiodide (+/-)-1] was resolved into enantiomeric forms. Their absolute configurations were established by a synthetic pathway that also allowed the synthesis of the corresponding diastereomeric (+)- and (-)-trans-2-methyl-5-[(dimethylamino)-methyl]-1,3-oxathiolane methiodide [(+)- and (-)-10]. Compound (+)-1, which is the most potent of the four isomers, showed the same absolute configuration as L-(+)-muscarine and (+)-cis-dioxolane. The four isomers were tested on guinea pig ileum and frog rectus abdominis, and their muscarinic and nicotinic potency (EPMR) and selectivity were determined. The relationships between stereoisomerism and potency are discussed.
TEODORI E.; GUALTIERI F.; ANGELI P.; BRASILI L.; GIANNELLA M.; PIGINI M., J. MED. CHEM., 29,(1986) N 9, 1610-1615
ROMANELLI, M. NOVELLA;TEODORI, ELISABETTA;GUALTIERI, FULVIO;ANGELI, PIERO+, J. MED. CHEM., 31,(1988) N 9, C. 1698-1702
作者:ROMANELLI, M. NOVELLA、TEODORI, ELISABETTA、GUALTIERI, FULVIO、ANGELI, PIERO+
DOI:——
日期:——
Total Synthesis of (±)-Spiroaxillarone A via a Reversible Sulfa-Michael Addition
作者:Xianwen Long、Min Zhang、Xiaodong Yang、Jun Deng
DOI:10.1021/acs.orglett.1c04282
日期:2022.2.18
A bioinspired strategy is described for the totalsynthesis of spiroaxillarone A, which exhibited significant antimalarial activity against resistant Plasmodium falciparum (IC50 = 2.32 μM). The key steps include an intermolecular ethanethiol Michael addition, o-quinone Michael addition, and subsequent β-ethanethiol elimination. This synthetic sequence provides a potential biosynthetic pathway of spiroaxillarone
描述了一种用于全合成螺菌酮 A 的仿生策略,该策略对耐药性恶性疟原虫具有显着的抗疟活性(IC 50 = 2.32 μM)。关键步骤包括分子间乙硫醇迈克尔加成、邻醌迈克尔加成和随后的 β-乙硫醇消除。该合成序列提供了螺菌酮 A 的潜在生物合成途径。
Molecular requirements of the recognition site of cholinergic receptors. 27. Enantioselectivity of muscarinic antagonists. 2,2-Dicyclohexyl-5-[(dimethylamino)methyl]-1,3-oxathiolane methiodides and related 3-oxides
The enantiomers of three chiral muscarinic antagonists carrying a 1,3-oxathiolane nucleus were prepared and their absolute configuration established. The enantioselectivity and tissue selectivity of such compounds were studied on rat bladder and guinea pig ileum and heart. The results show that introduction of a sulfoxide function brings about a small but definite enantioselectivity in the 1,3-oxathiolane compound (2), which in itself does not show enantioselectivity among the tissues studied. The results obtained point to differences among cardiac and ileal muscarinic receptors. Comparison of the absolute configuration related agonists shows that the most potent isomers of both series share the same absolute stereochemistry.