Olefin Oxyamination with Unfunctionalized
<i>N</i>
‐Alkylanilines
作者:Shuang Gao、Meike Niggemann
DOI:10.1002/adsc.201801407
日期:2019.4
N‐Alkylanilines have rarely been used in oxyamination reactions, due to the normally necessary pre‐functionalization of the N‐atom. Also, the formation of aminium radical cations (ARCs) of anilines bearing alkyl substituents is plagued by the ARC's tendency to instantaneously convert to α‐aminoradicals or iminium ions. We present a readily available reagent combination that addresses both challenges
Direct Olefination of Alcohols with Sulfones by Using Heterogeneous Platinum Catalysts
作者:S. M. A. Hakim Siddiki、Abeda Sultana Touchy、Kenichi Kon、Ken-ichi Shimizu
DOI:10.1002/chem.201505109
日期:2016.4.18
catalysts for the direct Julia olefination of alcohols in the presence of sulfones and KOtBu under oxidant‐free conditions. Primary alcohols, including aryl, aliphatic, allyl, and heterocyclic alcohols, underwent olefination with dimethyl sulfone and aryl alkyl sulfones to give terminal and internal olefins, respectively. Secondary alcohols underwent methylenation with dimethyl sulfone. Under 2.5 bar
发现在无氧化剂条件下,在砜和KO t Bu存在的情况下,碳负载的Pt纳米颗粒(Pt / C)是有效的多相催化剂,可直接用于醇的Julia烯化反应。伯醇,包括芳基,脂族,烯丙基和杂环醇,分别与二甲基砜和芳基烷基砜进行烯烃化反应,分别得到末端烯烃和内部烯烃。仲醇与二甲基砜进行亚甲基化。在2.5 bar H 2下,相同的反应体系对于将醇OH基团转化为烷基基团是有效的。末端烯烃化系统的结构和机理研究表明Pt 0Pt金属颗粒上的两个位点是限制醇脱氢速率的原因,而KO t Bu可能会使砜试剂脱质子。Pt / C催化剂在烯化后可重复使用,与以前报道的方法相比,该方法显示出更高的周转数(TON)和更宽的底物范围,这证明了本方法的高催化效率。
Naftifine-analogues as anti-Trypanosoma cruzi agents
oxidative stress. Here, we describe the synthesis and the activity of new containing bioactive-heterocycles analogues of naftifine as potential T. cruzi membrane sterolbiosynthesisinhibitors. Benzimidazole 1,3-dioxides (11 and 13) and quinoxaline 1,4-dioxides (22 and 23) displayed excellent parasite/mammal selectivity indexes. Analysis of the free sterols from parasite incubated with the compounds
Curable crosslinking system with monobenzaldimine as crosslinker
申请人:Air Products and Chemicals, Inc.
公开号:US05451653A1
公开(公告)日:1995-09-19
This invention relates to improved crosslinking systems for polymeric dispersions and solutions having suitability for coatings, adhesives and use in many other applications. These systems are based upon crosslinkable polymers having a plurality of activated keto methylene groups, e.g., a beta diketone such as an acetoacetate or a keto cyano methylene functional groups and a crosslinkable component comprising an aldimine. A sufficient amount of the aldimine curing agent is used to effect reaction with the polymer containing the activated keto methylene groups and cure thereof. The improvement in the crosslinking system resides in the utilization of a monoaldimine having only one aldimine group and no other methylene reactive group as a crosslinking agent. Another improvement variation to that previously suggested comprises a redispersible polymer(s) containing activated methylene functionality and combined with the monoaldimine and the use of heterocyclic aldimine.