A new multicomponent approach to the synthesis of substituted furan-2(5H)-ones containing 4H-chromen-4-one fragment
作者:Boris V. Lichitsky、Valeriya G. Melekhina、Andrey N. Komogortsev、Mikhail E. Minyaev
DOI:10.1016/j.tetlet.2020.152602
日期:2020.12
for the preparation of furan-2(5H)-one derivatives containing 4H-chromen-4-one fragment was developed. The suggested approach based on tandem multicomponent reaction of 3-(dimethylamino)-1-(2-hydroxyphenyl)prop-2-en-1-one, arylglyoxals and Meldrum’s acid. A distinctive feature of the proposed protocol is simultaneous formation of 4H-chromen-4-one and furan-2(5H)-one fragments at one synthetic stage
建立了一种有效的望远镜方法,制备了含4 H -chromen-4-one片段的呋喃-2(5 H)-one衍生物。基于3-(二甲基氨基)-1-(2-羟基苯基)丙-2-烯-1-酮,芳基乙二醛和Meldrum酸的串联多组分反应的建议方法。拟议协议的一个显着特征是在一个合成阶段同时形成4 H -chromen-4-one和呋喃2(5 H)-one片段。该合成方法的优点是反应条件温和,原子经济且易于后处理,可避免色谱纯化。通过X射线衍射确定呋喃-2(5 H)-one衍生物之一的结构。
Regioselective Olefination and Arylation of Arene-Tethered Diols Using the Easily Foldable Directing Groups
作者:Fucheng Yin、Yifan Chen、Zhongwen Luo、Shang Li、Yonglei Zhang、Siyuan Wan、Xinxin Li、Lingyi Kong、Xiaobing Wang
DOI:10.1021/acs.orglett.4c00096
日期:2024.2.23
structural motifs of drug and bioactive natural product molecules. In this study, a regioselective protocol for olefination and arylation of arene-tethered 1,2-diols and 1,3-diols has been developed using easily foldable acetal structures for attaching pyridine and nitrile directinggroups. The method overcomes the steric hindrance effect of the short-chain diols and affords products in high yield and
ring-opening carboxylation of styrene carbonates with CO2 to achieve dicarboxylic acids and/or β-hydroxy acids has been developed via the selective cleavage of the C(sp3)–O bond in cyclic carbonates. The product selectivity is probably determined by the stability and reactivity of the key benzylic radical and carbanionintermediate.
通过选择性裂解环状碳酸酯中的 C(sp 3 )–O 键,开发了苯乙烯碳酸酯与 CO 2的电还原开环羧化以获得二羧酸和/或β-羟基酸。产物选择性可能由关键的苄基和碳负离子中间体的稳定性和反应性决定。