One‐Pot Catalytic Enantioselective Synthesis of 2‐Pyrazolines
作者:Connor J. Thomson、David M. Barber、Darren J. Dixon
DOI:10.1002/anie.201811471
日期:2019.2.18
A scalable, one‐pot, enantioselective catalytic synthesis of 2‐pyrazolines from beta‐substituted enones and hydrazines is described. Pivoting on a two‐stage catalytic Michael addition/condensation strategy, the use of an aldehyde to generate a suitable hydrazone derivative of the hydrazine was found to be key for curtailing background reactivity and tuning the catalyst‐controlled enantioselectivity
Microwave-Assisted Convenient Synthesis of<i>α</i>,<i>β</i>-Unsaturated Esters and Ketones<i>via</i>Aldol-Adduct Elimination
作者:Pathi Suman、Rayala Nageswara Rao、Bhimapaka China Raju
DOI:10.1002/hlca.201200526
日期:2013.8
Various fluorinated 3‐oxo ester/1,3‐diketones were reacted with carbonyl compounds, in presence of piperidine and under microwave irradiation, to afford (E)‐α,β‐unsaturated esters and ketones in good yields. The systematic study reveals that the reaction proceeded through the formation of aldol adduct. The method provides a new and simple way for C,C bond formations.
3-Aryl β-carbolin-1-ones as a new class of potent inhibitors of tumor cell proliferation: synthesis and biological evaluation
作者:Shaozhong Wang、Yanmei Dong、Xinyan Wang、Xiaoyi Hu、Jun O Liu、Yuefei Hu
DOI:10.1039/b412921k
日期:——
A novel three-step synthesis of 3-aryl β-carbolin-1-ones from non-indole starting materials has been developed. The two nitrogen atoms in β-carbolin-1-one were introduced efficiently by Michael addition of ethyl acetamidocyanoacetate to chalcone. The desired pyridone and indole rings were assembled by an intramolecular ketoneânitrile annulation mediated by aqueous HClâHOAc and a Cu(I)-catalyzed intramolecular N-arylation of the amide, respectively. The target compounds were found to possess significant activity against tumor cell proliferaton.
In this Letter, we disclose a simple and effective method to access a variety of phenanthro[9,10-b]furan and 1H-dibenzo[e,g]indole derivatives based on the design of a carbene-catalyzed intramolecular Stetter reaction followed by a Paal–Knorr reaction in one-pot. These compounds are a class of π-extended polycyclic aromatic hydrocarbon (PAH) derivatives containing an oxygen/nitrogen atom. The practical
在这封信中,我们基于卡宾催化的分子内 Stetter 反应的设计,公开了一种简单有效的方法来获得各种菲 [9,10- b ] 呋喃和 1 H-二苯并 [ e , g ]吲哚衍生物通过一锅中的 Paal-Knorr 反应。这些化合物是一类含有氧/氮原子的 π 延伸多环芳烃 (PAH) 衍生物。所开发转化的实际效用在克级及其合成后转化上得到证明。