Water‐Compatible Hydrogen‐Bond Activation: A Scalable and Organocatalytic Model for the Stereoselective Multicomponent Aza‐Henry Reaction
作者:Fabio Cruz‐Acosta、Pedro de Armas、Fernando García‐Tellado
DOI:10.1002/chem.201303448
日期:2013.12.2
H‐bond catalysis: The first example of a stereoselectivemulticomponentaza‐Henryreaction catalyzed by a combination of a chiral H‐bond donor organic molecule (thiourea‐ or squaramide‐containing catalyst) and a Lewis base (tertiary amine) in the presence of water is described (see scheme). Each family of catalysts delivers the β‐nitroamine derivative with complementary enantioselectivity, allowing
Synthesis and evaluation of various heteroaromatic benzamides as analogues of –ylidene-benzamide cannabinoid type 2 receptor agonists
作者:Michael Moir、Rochelle Boyd、Hendra Gunosewoyo、Andrew P. Montgomery、Mark Connor、Michael Kassiou
DOI:10.1016/j.tetlet.2019.151019
日期:2019.9
expand the structure-activity relationship studies of this series of compounds by investigating the heteroaromatic core via the synthesis and in vitro evaluation of a small library of various heteroaromatic benzamide analogues. As heteroaromatic amides are privileged scaffolds in drug design, methods to synthesise them are of interest. Concise and reliable synthetic strategies were developed to access these
The present invention provides compounds useful as inhibitors of Raf protein kinase. The present invention also provides compositions thereof, and methods of treating Raf-mediated diseases.
Electrophilic ring opening of oxazolines derived from serine and threonine: A practical entry to N(N)-protected β-halogeno α-aminoesters
作者:Abdelhamid Laaziri、Jacques Uziel、Sylvain Jugé
DOI:10.1016/s0957-4166(98)00002-0
日期:1998.2
Treatment of oxazolines 4a–c derived fromserine or threonine with chloroformates, leads to the oxazoline ring opening and to the formation of N,N-protected β-chloro-α-aminoesters 1a–e in 30–88% isolated yields. In the presence of NaI (0.9 equiv), oxazolines 4a,b,d react with ethyl chloroformate to afford the N,N-protected β-iodo α-amino esters 1f–h (67–89% yields), whereas the reaction of 4a,b with
A mild synthesis of [1,2,4]triazolo[4,3-a]pyridines
作者:Michael A. Schmidt、Xinhua Qian
DOI:10.1016/j.tetlet.2013.08.024
日期:2013.10
The reaction between 2-hydrazinopyridines and ethyl imidates was examined as a one-pot method for rapidly preparing [1,2,4]triazolo[4,3-a]pyridines. A diverse set of 2-hydrazinopyridines were cyclized with a variety of alkyl- and aryl-substituted ethyl imidates in good yields. The reaction proceeds optimally under mild conditions (50−70 °C) using 1.5 equiv of acetic acid. The electronic and steric
作为快速制备[1,2,4]三唑并[4,3- a ]吡啶的一锅法,研究了2-肼基吡啶和酰亚胺乙酯之间的反应。用各种烷基取代基和芳基取代的乙基酰亚胺酯以高收率将各种不同的2-肼基吡啶环化。使用1.5当量的乙酸,在温和的条件下(50-70°C),反应可以最佳地进行。肼和亚氨酸酯的电子和位阻性质强烈影响反应速率。当使用高度缺乏电子的2-肼基吡啶时,产物重排为[1,2,4]三唑并[1,5- a ]吡啶。