使用简单的一锅法合成了许多新的稳定的甲烷苯并[7,8][1,3]二氧代[4,5 - d ]嘧啶-1,3(2 H )-二酮衍生物( 4a-l )具有可观的效率。进一步优化反应参数以实现单一产品程序。研究了反应进程的合理途径,并证明该反应通过区域选择性缩合产生有趣的 V 形结构。所研究的所有产品的光谱数据用于阐明化学结构,并进行 X 射线结构分析以明确证明4c的拟议结构。
From Waste Biomass to Solid Support: Lignosulfonate as a Cost-Effective and Renewable Supporting Material for Catalysis
作者:Shaohuan Sun、Rongxian Bai、Yanlong Gu
DOI:10.1002/chem.201303364
日期:2014.1.7
2) lignin‐SO3Cu(OTf), and 3) lignin‐IL@NH2 (IL=ionic liquid). These solidmaterials were then examined in many organic transformations. It was finally found that, compared with its homogeneous counterpart as well as some other solid catalysts that are prepared by using different supports with the same metal or catalytically active species, the lignin‐supported catalysts showed better performance in these reactions
SIMPLE AND RAPID PROCEDURE FOR THE SYNTHESIS OF SOME NEW 2<i>H</i>-CHROMENES
作者:A. Zonouzi、M. Sadeghi Googheri、P. S. Miralinaghi
DOI:10.1080/00304940809458109
日期:2008.10
hypoglycemic, cardio-protective agents,3v4 and as insecticides? Some of their derivatives are utilized in the synthesis of new macrocyclic ligands6 and others have shown photochromic properties? These interesting properties of 2H-chromenes led us to investigate a simple and efficient synthesis with the goal of obtaining more potent pharmacologically active compounds. Various methods are known to obtain
Divergent Domino Reactions of Prop-2-ynylsulfonium Salts: Access to Sulfur-Containing Benzo-Fused Dioxabicyclo[3.3.1]nonanes and Dihydrofuro[2,3-<i>c</i>]chromenes
作者:Yiming Zhou、Yu Chen、You Huang
DOI:10.1021/acs.orglett.0c02025
日期:2020.8.7
domino annulation reactions between 2-hydroxy-2-methylchromene derivatives and prop-2-ynylsulfonium salts have been developed. Specifically, a sequential [4 + 2] and [4 + 2] annulation reaction occurred in 1,2-dichloroethane affording sulfur-containing benzo-fused dioxabicyclo[3.3.1]nonanes. In contrast, by changing the solvent to toluene, the reaction course switched to a [4 + 2] and [4 + 1] annulation
已经开发了2-羟基-2-甲基苯甲基衍生物和丙-2-炔基ulf盐之间的溶剂控制的发散性多米诺环化反应。具体地,在[1,2-二氯乙烷]中发生顺序的[4 + 2]和[4 + 2]环化反应,得到含硫的苯并稠合的二氧杂双环[3.3.1]壬烷。相反,通过将溶剂改变为甲苯,反应过程切换为[4 + 2]和[4 +1]环化反应,得到二氢呋喃[2,3- c ]二甲基苯。值得注意的是,丙-2-炔基salt盐首次以其γ-碳原子参与转化。
A Facile Synthetic Route to 2H-Chromenes: Reconsideration of the Mechanism of the DBU-Catalyzed Reaction between Salicylic Aldehydes and Ethyl 2-Methylbuta-2,3-dienoate
作者:Lun-Zhi Dai、Yong-Ling Shi、Gui-Ling Zhao、Min Shi
DOI:10.1002/chem.200601033
日期:2007.4.27
Reactions of salicylaldehydes with ethyl buta-2,3-dienoate or penta-3,4-dien-2-one catalyzed by a catalytic amount of potassium carbonate produce the corresponding 2 H-chromene products in moderate to good yields under mild conditions. A plausible reactionmechanism is discussed in the light of the results of an 18O-labeling experiment. In addition, in view of these findings, the catalytic function
Cascade Reaction of
<i>o</i>
‐Haloaryl Ynone and 2‐Hydroxy‐2‐Methylchromene: Synthesis of Chromone Derivative Enabled by Oxygen‐Migration
作者:Jie Shen、Yao Xiao、Peichao Zhao、Dong Li、Xueshun Jia、Xin Peng、Jian Li
DOI:10.1002/adsc.202100946
日期:2022.1.18
and 2-hydroxy-2-methylchromene under transition metal-free conditions. This strategy proceeds through double Michael addition and oxygen-migration, thus providing a straight way for the synthesis of chromonederivatives.