Enantioselective Desymmetrization of 1,3-Diols by a Chiral DMAP Derivative
作者:Hiroki Mandai、Kosuke Ashihara、Koichi Mitsudo、Seiji Suga
DOI:10.1246/cl.180697
日期:2018.11.5
We developed an enantioselective desymmetrization of 1,3-diols by a chiral N,N-dimethyl-4-aminopyridine (DMAP) derivative containing a 1,1′-binaphthyl with tert-alcohol units. The reactions require...
[Problem]
An excellent drug for treating or preventing cardiovascular diseases, based on cGMP production enhancing action due to soluble guanylate cyclase activating action, is provided.
[Means for Solution]
It was found that imidazopyridine compounds having a carbamoyl group at the 3-position and a substituent bonded at the 8-position via an oxygen atom in an imidazo[1,2-a]pyridine skeleton exhibits a cGMP production enhancing action by a potent soluble guanylate cyclase activating action, and is useful as a drug for treating or preventing various soluble guanylate cyclase-related cardiovascular diseases, thereby completing the present invention.
Transition-metal-catalyzed enantioselective functionalization of acyl radicals has so far not been realized, probably due to their relatively high reactivity, which renders the chemo- and stereocontrol challenging. Herein, we describe Cu(I)-catalyzed enantioselective desymmetrizing C–O bond coupling of acyl radicals. This reaction is compatible with (hetero)aryl and alkyl aldehydes and, more importantly
The transition-metal-catalysed cross-couplingreaction has established itself as one of the most reliable and practical synthetic tools for the efficient construction of carbon–carbon/heteroatom (p-block elements other than carbon) bonds in both racemic and enantioselective manners. In contrast, development of the corresponding heteroatom–heteroatom cross-couplings has so far remained elusive, probably
过渡金属催化的交叉偶联反应已成为高效构建碳-碳/杂原子的最可靠和实用的合成工具之一(p-除碳以外的嵌段元素)以外消旋和对映选择性方式键合。相比之下,迄今为止,相应的杂原子-杂原子交叉偶联的发展仍然难以捉摸,这可能是由于研究不足且通常具有挑战性的杂原子-杂原子还原消除。在这里,我们基于实验和理论结果展示了使用单电子还原消除作为在 Cu 催化下开发对映选择性 S-O 偶联的策略。该反应通过制备具有拥挤立体中心的具有挑战性的手性醇、生物质衍生的原料甘油的权宜之计以及肌醇的显着催化 4,6-去对称化,显示了其合成潜力。
Transparent resin and plastic lens
申请人:HITACHI CHEMICAL CO., LTD.
公开号:EP0661307A2
公开(公告)日:1995-07-05
A transparent resin obtained by polymerizing a monomer having an alkylene oxide group, a polyfunctional (meth)acrylate having a divalent branched hydrocarbon group and other copolymerizable vinyl monomer, if necessary, is suitable as an elementary material for a plastic lens with excellent heat resistance and hue.