Reactions of carbonyl compounds in basic solutions. Part 9. Methoxide-catalysed cyclization of benzylidenephthalides and methyl o-phenylacetylbenzoates
作者:Keith Bowden、Mohsen Chehel-Amiran
DOI:10.1039/p29860002031
日期:——
The detailed mechanism of the methoxide-catalysed rearrangement of substituted benzylidenephthalides and both normal and pseudo methyl o-phenylacetylbenzoates to form 2-phenylindane-1,3-diones has been studied. A rate–acidity function correlation for the reactions in methanolic dimethyl sulphoxide (DMSO) shows a linear increase in rate with increasing H_ to reach a maximum in rate before decreasing
研究了甲醇催化取代的亚苄基萘以及正和邻甲基邻苯基乙酰苯甲酸甲酯形成2-苯基茚满-1,3-二酮的重排的详细机理。在甲醇二甲基亚砜(DMSO)中反应的速率-酸度函数相关性显示速率随H _线性增加,在对硝基底物除外之前达到最大速率。该导数显示出在整个H _范围内速率降低。甲醇和94 mol%的DMSO中的ρ值分别为1.7和–1.6。在k H / k D下观察到了动力学同位素效应0.8-1.0。已经确定了邻苯基乙酰基苯甲酸甲酯的环链互变异构的平衡常数,并且该常数不依赖于取代基和溶剂组成。决定速率的步骤是正酸酯的阴离子在酯羰基上的分子内攻击。在甲醇和高甲醇含量的甲醇DMSO中,这之前是正酸酯的电离平衡。在低甲醇含量的甲醇DMSO中,对于对硝基底物,初始状态是阴离子本身。
COMPOUNDS
申请人:GORE Martin Paul
公开号:US20080039444A1
公开(公告)日:2008-02-14
The present invention relates to compounds of formula (I),
and salts thereof, processes for their preparation, to compositions containing them and to their use in the treatment of various disorders, such as allergic rhinitis.
2-Substituted 4-Benzylphthalazinone Derivatives as Histamine H1 and H3 Antagonists
申请人:Gore Paul Martin
公开号:US20090105225A1
公开(公告)日:2009-04-23
The present invention relates to compounds of formula (I),
and salts thereof, processes for their preparation, to compositions containing them and to their use in the treatment of various disorders, such as allergic rhinitis.