The cleavage and transformation of alkenyl C(sp2)–N bonds is a significant synthetic challenge. Herein we described an unprecedented nickel-catalyzed reductive borylation of enaminones to synthesize β-ketone boronic esters. Notably, B2pin2 played the dual role in this process, and water served as a hydrogen source, which was transferred to target products. The air-stable nickel catalyst was applied
Facile access to the 2,2-difluoro-2,3-dihydrofuran skeleton without extra additives: DMF-promoted difluorocarbene formation of ClCF<sub>2</sub>CO<sub>2</sub>Na
A practical and facile difluorocarbene-triggered cycloaddition reaction of enaminones was developed, which delivered 2,2-difluoro-2,3-dihydrofurans without any extra additives.
Herein, a B2pin2-mediated radical cascade cyclization/aromatization reaction of enaminone with pyridine is described. This strategy provides a practical way for the construction of valuable functionalized indolizines under metal-, external oxidant-, and base-free conditions, which could be compatible with various kinds of functional groups, such as halogen, π-system, heterocycle, ferrocenyl, etc. A
在此,描述了烯胺酮与吡啶的 B 2 pin 2介导的自由基级联环化/芳构化反应。该策略为在无金属、无外部氧化剂和无碱条件下构建有价值的功能化中氮化合物提供了一种实用的方法,它可以与各种功能基团相容,如卤素、π-系统、杂环、二茂铁基、 etc. 初步的机理研究表明,原位形成的吡啶-硼基自由基引发了反应的发生。
Mn(OAc)2-promoted [3+2] cyclization of enaminone with isocyanoacetate: Rapid access to pyrrole-2-carboxylic ester derivatives with potent anticancer activity
compounds exhibit moderate antiproliferative activity against four cancer cells. Notably, compound 2n demonstrate the most potent activity with average IC50 values of 5.61 μM against four distinct cancer cell lines. Moreover, 2n exhibit favorable anti-migration activity and drug-like properties. The further investigation suggests that compound 2n possesses the ability to inhibit ERK5 activity and exhibits
开发了实用且简便的Mn(OAc) 2促进的烯胺酮与异氰乙酸酯的[3+2]环加成反应,产生了多种具有广泛底物范围的3-芳酰基吡咯-2-羧酸酯。大多数新合成的化合物对四种癌细胞表现出中等的抗增殖活性。值得注意的是,化合物2n对四种不同的癌细胞系表现出最有效的活性,平均 IC 50值为 5.61 μM。此外,2n表现出良好的抗迁移活性和药物样特性。进一步的研究表明,化合物2n具有抑制ERK5活性的能力,并表现出与ERK5蛋白的有效结合,使其成为一类新型ERK5抑制剂发现的先导化合物的有希望的候选者。
Synthesis and structure–activity relationship of aminopyrimidine IKK2 inhibitors
作者:Alistair H. Bingham、Richard J. Davenport、Richard Fosbeary、Lewis Gowers、Roland L. Knight、Christopher Lowe、David A. Owen、David M. Parry、Will R. Pitt
DOI:10.1016/j.bmcl.2008.04.062
日期:2008.6
The synthesis and structure-activity relationship of a novel series of aminopyrimidines are exemplified. Results of key compounds from within this series in the E-selectin reporter cell assay are also reported. (C) 2008 Elsevier Ltd. All rights reserved.