Hemilabile Benzyl Ether Enables γ-C(sp3)–H Carbonylation and Olefination of Alcohols
摘要:
Pd-catalyzed C(sp(3))-H activation of alcohol typically shows beta-selectivity due to the required distance between the chelating atom in the attached directing group and the targeted C-H bonds. Herein we report the design of a hemilabile directing group which exploits the chelation of a readily removable benzyl ether moiety to direct gamma- or delta-C-H carbonylation and olefination of alcohols. The utility of this approach is also demonstrated in the late-stage C-H functionalization of beta-estradiol to rapidly prepare desired analogues that required multi-step syntheses with classical methods.
An efficient iron-catalyzed intermolecular remote C(sp3)–H heteroarylation of alkyl ketones has been developed via an iminyl radical-triggered 1,5-hydrogen-atom transfer (HAT) cascade. This protocol was amenable to a wide variety of alkyl ketones and heteroaryls, thus providing a straightforward method for the late-stage functionalization of alkylketones and heteroaryls.
Intermolecular Multiple Dehydrogenative Cross‐Couplings of Ketones with Boronic Acids and Amines via Copper Catalysis
作者:Tianzhang Wang、Guowei Chen、Yu‐Jing Lu、Qian Chen、Yanping Huo、Xianwei Li
DOI:10.1002/adsc.201900419
日期:2019.8.21
versatile oxidative coupling reaction was developed for the synthesis of valuable β‐functionalized unsaturatedketones and meta‐substituted phenols. In the case of intramolecular reactions, achieving rapid molecular complexity through multiple dehydrogenative couplings is already a well‐established strategy. Herein, we report an intermolecular multiple dehydrogenative coupling between ketones and nucleophilic
Diazo Decomposition in the Presence of Tributyltin Hydride. Reduction of α-Diazo Carbonyl Compounds
作者:Zhongping Tan、Zhaohui Qu、Bei Chen、Jianbo Wang
DOI:10.1016/s0040-4020(00)00678-5
日期:2000.9
The diazo group of a series of α-diazo carbonyl compounds can be reduced to the corresponding CH2 group by Bu3SnH under Cu(acac)2-catalytic or photochemical conditions. The mechanistic aspects of this reaction were investigated in some detail, and a possible reaction pathway was discussed.
Über reaktionen mit aluminiumalkylen XII. Konkurrierende eigenschaften von alkylaluminiumverbindungen: reaktionspartner und friedel-crafts-katalysator
作者:Heinz Reinheckel、Rita Gensike
DOI:10.1016/s0022-328x(00)88854-3
日期:1968.7
The double effect of ethylaluminium sesquichloride on ω-phenylcarboxylic acid chlorides with a chain length of C3 to C6, namely alkylation and Friedel-Crafts cyclization was investigated. It was established that the two alternatives are possible only with 4-phenylbutyryl chloride. Depending on the reaction conditions, both alkylation and cyclization yield 6-phenyl-3-hexanone, as well as 1-tetralone
[EN] SUBSTITUTED (ARYL, HETEROARYL, ARYLMETHYL OR HETEROARYLMETHYL) HYDROXAMIC ACID COMPOUNDS<br/>[FR] COMPOSES D'ACIDE (ARYLE, HETEROARYLE, ARYLMETHYLE OU HETEROARYLMETHYLE) HYDROXAMIQUE SUBSTITUES
申请人:RHONE-POULENC RORER PHARMACEUTICALS INC.
公开号:WO1997024117A1
公开(公告)日:1997-07-10
(EN) This invention is directed to compounds of formula (I), wherein the variables are as described herein. Compounds within the scope of the present invention possess useful properties, more particularly pharmaceutical properties. They are especially useful for inhibiting the production or physiological effects of TNF in the treatment of a patient suffering from a disease state associated with a physiologically detrimental excess of tumor necrosis factor (TNF). Compounds within the scope of the present invention also inhibit cyclic AMP phosphodiesterase, and are useful in treating a disease state associated with pathological conditions that are modulated by inhibiting cyclic AMP phosphodiesterase, such disease states including inflammatory and autoimmune diseases, in particular type IV cyclic AMP phosphodiesterase. Compounds within the scope of the present invention may also inhibit an MMP, and are useful in treating a disease state associated with pathological conditions that are modulated by inhibiting MMPs, such disease states involve tissue breakdown and those associated with a physiologically detrimental excess of TNF. The present invention is therefore also directed to the pharmaceutical use of the compounds, pharmaceutical compositions containing the compounds, intermediates leading thereto and methods for the preparation of the compounds and their intermediates.(FR) L'invention concerne des composés de formule (I), dans laquelle les variables ont la signification décrite. Les composés couverts par la présente invention ont des propriétés utiles, en particulier des propriétés pharmaceutiques. Ils sont particulièrement utiles pour inhiber la production ou les effets physiologiques du facteur de nécrose de tumeurs pendant le traitement d'un patient souffrant d'un état pathologique associé à un excès préjudiciable du point de vue physiologique du facteur de nécrose de tumeurs. Les composés décrits inhibent également l'AMP phosphodiestérase cyclique et sont utiles pour traiter des états pathologiques associés à des conditions pathologiques que l'on peut modérer en inhibant l'AMP phosphodiestérase cyclique. Ces états pathologiques comprennent les maladies inflammatoires et auto-immunes, notamment l'AMP phosphodiestérase cyclique de type IV. Ces composés peuvent également inhiber une métalloprotéinase matricielle et sont utiles pour traiter des états pathologiques associés à des conditions pathologiques que l'on peut modérer en inhibant les métalloprotéinases matricielles. Ces états pathologiques impliquent la dégradation des tissus et les états associés à un excès préjudiciable du point de vue physiologique du facteur de nécrose des tumeurs. L'invention concerne également l'utilisation pharmaceutique de ces composés, des compositions pharmaceutiques qui contiennent ces composés, des produits intermédiaires de préparation de ces composés et des procédés de préparation de ces composés et de leurs produits intermédiaires.