N-Heterocyclic Carbene Catalyzed Intramolecular Hydroacylation of Activated Alkynes: Synthesis of Chromones
作者:Seenuvasan Vedachalam、Qian-Ling Wong、Biswajit Maji、Jing Zeng、Jimei Ma、Xue-Wei Liu
DOI:10.1002/adsc.201000828
日期:2011.2.11
An organocatalytic intramolecular Stetter-type hydroacylation reaction between an aldehyde and an activated alkyne has been developed. This study induces salicylaldehyde-derived alkyne derivatives to assemble into a series of chromone derivatives using a catalytic amount of thiazolium-based carbene catalyst.
Gold-Catalyzed Tandem Intramolecular Heterocyclization/Petasis-Ferrier Rearrangement of 2-(Prop-2-ynyloxy)benzaldehydes as an Expedient Route to Benzo[b]oxepin-3(2 H)-ones
作者:Ella Min Ling Sze、Weidong Rao、Ming Joo Koh、Philip Wai Hong Chan
DOI:10.1002/chem.201003096
日期:2011.2.1
The golden ring: A synthetic approach to benzo[b]oxepin‐3(2H)‐ones by heterocyclization/Petasis–Ferrierrearrangement of 2‐(prop‐2‐ynyloxy)benzaldehydes is reported. Uniquely, the ring formation was found to only proceed efficiently in the presence of a gold catalyst. Substitution at the position ortho to the ethereal group on the salicylaldehyde ring was shown to dramatically enhance reactivity (see
金环:通过2-(prop-2-ynyloxy)苯甲醛的杂环化/ Petasis-Ferrier重排,合成了苯并[ b ] oxepin-3(2 H)-ones的合成方法。独特地,发现仅在金催化剂存在下成环有效地进行。显示在水杨醛环上的醚基的邻位取代可显着增强反应性(见图)。
Zirconium oxide (NP) - ionic liquid as an efficient media for the domino Knoevenagel hetero Diels-Alder reaction with unactivated alkynes
作者:Saeed Balalaie、Ali Poursaeed、Malihe Javan Khoshkholgh、Hamid Reza Bijanzadeh、Eckardt Wolf
DOI:10.1016/j.crci.2011.12.002
日期:2012.4
Immobilized ZrO 2 -nanopowder (NP) in ionic liquid and different organic solvents was used as a suitable Lewis-acid for the synthesis of polycyclic heterocycles which contains pyran-based skeletons. Reaction of O -propargylated salicylaldehyde with activemethylenecompounds in the presence of ZrO 2 -NP in ionic liquid proceeds via domino Knoevenagel hetero Diels-Alder reaction of unactivated alkynes
Unprecedented synthesis of aza-bridged benzodioxepine derivatives through a tandem Rh(<scp>ii</scp>)-catalyzed 1,3-rearrangement/[3+2] cycloaddition of carbonyltriazoles
作者:Yong-Sheng Zhang、Xiang-Ying Tang、Min Shi
DOI:10.1039/c4cc08339c
日期:——
Rh(II)-catalyzed novel tandem intramolecularcycloisomerizations of aldehydes or ketones with 1-sulfonyl 1,2,3-triazoles have been disclosed, providing a facile protocol to access a series of functionalized aza-bridged benzodioxepine heterocycles.
Propargylated monocarbonyl curcumin analogues: synthesis, bioevaluation and molecular docking study
作者:Amol A. Nagargoje、Satish V. Akolkar、Dnyaneshwar D. Subhedar、Mubarak H. Shaikh、Jaiprakash N. Sangshetti、Vijay M. Khedkar、Bapurao B. Shingate
DOI:10.1007/s00044-020-02611-7
日期:2020.10
the current experimental study, we have synthesised new monocarbonyl curcumin analogues bearing propargyl ether moiety in their structure and evaluated for in vitro antifungal and radical scavenging activity. The antifungal activity was carried out against five human pathogenic fungal strains such as Candida albicans, Fusarium oxysporum, Aspergillus flavus, Aspergillusniger and Cryptococcus neoformans