Optically active isomers of quinine and quinidine and their respective biological action
申请人:——
公开号:US20030212098A1
公开(公告)日:2003-11-13
The present invention provides methods for purifying, identifying and using optically active isomers of quinine and quinidine as well as compositions comprising such optically active isomers. Such optically active isomers having desired actions on cardiac sodium and potassium channel function substantially separable from undesirable effects on GI motility can be useful for more effective therapy of cardiac arrhythmias. Also disclosed are methods for assaying the levels of such isomers present in the biological fluids.
Diastereoselective Synthesis of Less Accessible Fluorine-Containing Acyclic Tetrasubstituted Stereocenters via Electrophilic Fluorination of β,β-Disubstituted Metalloenamines
作者:Tao Liu、Nuermaimaiti Yisimayili、Li-Feng Chu、Chong-Dao Lu
DOI:10.1021/acs.joc.4c00306
日期:2024.4.19
to construct less accessible fluorine-containing acyclic tetrasubstituted stereocenters bearing two sterically and electronically similar alkyl groups at the α-position of carbonyls. In this process, tBuOK-promoted stereospecific α-deprotonation of α,α-disubstituted N-tert-butanesulfinyl ketimines or NH deprotonation of β,β-disubstitutedenesulfinamides generates geometry-defined multisubstituted metalloenamines
开发了一种立体控制方案来构建不易接近的含氟无环四取代立构中心,在羰基的α位上带有两个空间和电子相似的烷基。在此过程中, t BuOK 促进的 α,α-二取代N-叔丁亚磺酰基酮亚胺的立体特异性 α-去质子化或 β,β-二取代烯亚磺酰胺的 NH 去质子化生成几何定义的多取代金属烯胺,然后与N-叔丁烷亚磺酰基酮亚胺进行立体选择性亲电氟化。奎宁的氟铵盐,提供具有优异非对映选择性的无环α-氟化酮亚胺。
Microwave assisted sulfopropylation of N-heterocycles using 1,3-propane sultone
作者:Maciej Adamczyk、Sushil Rege
DOI:10.1016/s0040-4039(98)02301-6
日期:1998.12
Dramatic rare acceleration was observed for N-sulfopropylation of heterocyclic compounds (1a-h) using 1,3-propane sultone(2) under microwave irradiation affording the N-sulfopropylated compounds (3a-h) in 68-95% yield. (C) 1998 Elsevier Science Ltd. All rights reserved.