Bromination of Enamines from Tertiary Amides Using the Petasis Reagent: A Convenient One-Pot Regioselective Route to Bromomethyl Ketones
作者:Marwan Kobeissi、Khalil Cherry、Wissam Jomaa
DOI:10.1080/00397911.2013.765484
日期:2013.11.2
bromomethyl ketones is achived using the Petasis reagent (dimethyltitanocene) as a key for enamine generation. Several amides were used to test the limits of the procedure by changing either the alkyl chain R or the amino portion of the starting materials. The enamines generated in situ were allowed to react with bromine at low temperature followed by hydrolysis to yield bromomethyl ketones in excellent
摘要 使用 Petasis 试剂(二甲基二茂钛)作为烯胺生成的关键,实现了溴甲基酮的原始一锅法合成。通过改变烷基链 R 或起始材料的氨基部分,使用几种酰胺来测试该程序的限制。使原位生成的烯胺在低温下与溴反应,然后水解,以极好的收率(85% 至 95%)得到溴甲基酮。简要讨论了反应的机理细节和最佳条件。本方法提供了几个优点,例如烯胺形成的区域选择性、良好的产率、温和的反应条件和易于实验。[本文提供补充材料。去出版商'
Silyl- and germylmercurials in organic synthesis. A new route to O-silylated and O-germylated enolates
The exchange reaction of α-mercurated ketones with bis(triethylsilyl)- (I) and bis(triethylgermyl)mercury (II) leads to the formation of the corresponding triethylsilyl and triethylgermyl enol ethers. O-Silylated and O-germylated enolates derived from ketones and aldehydes can be also prepared by treating mercurials I and II with appropriate α-bromo-carbonyl compounds. This new pathway also represents
[EN] INHIBITORS OF BRUTON'S TYROSINE KINASE AND METHODS OF THEIR USE<br/>[FR] INHIBITEURS DE TYROSINE KINASE DE BRUTON ET LEURS PROCÉDÉS D'UTILISATION
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2018103058A1
公开(公告)日:2018-06-14
Compounds of formula (I') and methods of their use and preparation, as well as compositions comprising compounds of formula (I').
公式(I')的化合物及其使用和制备方法,以及包含公式(I')化合物的组合物。
A Radical Bidirectional Fragment Coupling Route to Unsymmetrical Ketones
作者:Lucile Anthore-Dalion、Qiang Liu、Samir Z. Zard
DOI:10.1021/jacs.6b05344
日期:2016.7.13
A powerful strategy for the regioselective bidirectional synthesis of unsymmetrically substituted ketones is described, relying on the fact that the exchange of a xanthate is much faster than the radical addition to an unactivated alkene. The use of an alkene as the formal "alkylating" agent associated with the tolerance for numerous functional groups and the mildness of the experimental conditions
Dienolates of Cycloalkenones and α,β‐Unsaturated Esters Form Diels–Alder Adducts by a Michael/Michael‐Tandem Reaction Rather Than in One Step
作者:Ann‐Christine Loesche、Reinhard Brückner
DOI:10.1002/ejoc.201801193
日期:2019.1.23
lithium enolates by anionic Diels–Alder reactions. However, in principle, the respective products might form not only in a single step but also in two consecutive – or “tandem” – Michael additions, the first of which occurs intermolecularly, the second intramolecularly. Three cyclic lithium dienolates and four esters with a stereogenic Cα=Cβ bond reacted to give Diels–Alderadducts (10 times) or failed to
已知α,β-不饱和酯和1,3-二烯-2-醇锂通过阴离子Diels-Alder反应提供双环烯醇锂。但是,原则上,各自的产物不仅可以一步一步形成,而且可以连续两次(或“串联”)迈克尔加成形成,其中第一种在分子间发生,第二种在分子内发生。三个环状锂dienolates和四个酯与立体异构源ç α = C β键反应生成狄尔斯-阿尔德加合物(10次)或未反应(2次)。七个反应性组合提供了加合物,其中前一酯部分的构型部分被反转。这排除了一致的途径作为其起源。这是令人惊讶的,因为1,3-二烯的C-2的供体以烷基<芳基<烷氧基≈三烷基甲硅烷氧基<酰氨基的顺序加速了正常的电子需求Diels-Alder反应。李⊕ Ø ⊖是一个更好的捐赠者仍然,为什么机构是不可一致,而不是一致(和更异步)不是很明显。