Synthesis and biological evaluation of sulfur-containing shikonin oxime derivatives as potential antineoplastic agents
作者:Guang Huang、Hui-Ran Zhao、Qing-Qing Meng、Qi-Jing Zhang、Jin-Yun Dong、Bao-quan Zhu、Shao-Shun Li
DOI:10.1016/j.ejmech.2017.11.031
日期:2018.1
As a continuation of our research on developing potent and potentially safe antineoplasticagents, a set of forty five sulfur-containing shikonin oxime derivatives were synthesized and evaluated for their in vitro cytotoxic activity against human colon cancer (HCT-15), gastric carcinoma (MGC-803), liver (Bel7402), breast (MCF-7) cancer cells and human skin fibroblast (HSF) cells. All the synthesized
A novel ketone olefination via organozinc reagents in the presence of diphenyl phosphite
作者:Hua Cui、Ying Li、Songlin Zhang
DOI:10.1039/c2ob06821d
日期:——
Carbonyl compounds react with organozinc reagents in the presence of diphenyl phosphite to give the corresponding olefins. A variety of 1,3-dienes and unsaturated esters were obtained in moderate to excellent yields under mild conditions.
Efficient synthetic method for the preparation of allyl- and propargyl-epoxides by allylation and propargylation of α-haloketones with organozinc reagents
作者:Jie Pan、Min Zhang、Songlin Zhang
DOI:10.1039/c1ob06071f
日期:——
A simple, efficient, and non-metal catalyzed synthetic method for the preparation of substituted allyl- and propargyl-epoxides by allylation and propargylation of α-halo ketones with organozinc reagents in mild conditions is reported in this paper. The present method complements the existing synthetic methods due to some advantageous properties of the organozinc reagents such as availability, selectivity, operational simplicity and low toxicity.
作者:Mario Ellwart、Ilya S. Makarov、Florian Achrainer、Hendrik Zipse、Paul Knochel
DOI:10.1002/anie.201603923
日期:2016.8.22
Readily prepared allylic zinc halides undergo SN2‐type substitutions with allylic bromides in a 1:1 mixture of THF and DMPU providing 1,5‐dienes regioselectively. The allylic zinc species reacts at the most branched end (γ‐position) of the allylic system furnishing exclusively γ,α′‐allyl–allyl cross‐coupling products. Remarkably, the double bond stereochemistry of the allylic halide is maintained during
现成的烯丙基卤化锌在THF和DMPU的1:1混合物中用烯丙基溴进行S N 2型取代,可选择性地提供1,5二烯。烯丙基锌物种在烯丙基体系的最分支末端(γ位置)反应,专门提供γ,α'-烯丙基-烯丙基交叉偶联产物。值得注意的是,烯丙基卤的双键立体化学在交叉偶联过程中得以保持。还可以耐受几个官能团(酯,腈)。烯丙基锌试剂的这种交叉偶联可以扩展到炔丙基和苄基卤化物。DFT计算显示了氯化锂在该替代中的重要性。
Zinc-Mediated C-3 α-Prenylation of Isatins with Prenyl Bromide: Access to 3-Prenyl-3-hydroxy-2-oxindoles and Its Application
A convenient and highly α-regioselective strategy for the synthesis of 3-prenyl-3-hydroxy-2-oxindoles has been developed starting from isatins and prenylzinc with good to excellent yields. This protocol provides a straightforward and practical way to introduce an α-prenyl moiety into the C-3 position of isatins. The advantages of this reaction are use of the cheap and readily available reagents, operational