Simple and Efficient One Step Synthesis of Functionalized Flavanones and Chalcones
作者:ABDULLAH SAAD ALBOGAMI、USAMA KARAMA、AHMED AMINE MOUSA、M. KHAN、SARA ABDULLAH AL-MAZROA、HAMAD Z. ALKHATHLAN
DOI:10.13005/ojc/280201
日期:2012.6.18
A facile and highly efficient microwave-assisted synthesis of functionalizedchalcones and flavanones based on the Claisen-Schmidt condensation reaction is reported. The method describes the synthesis of flavanones in single step with excellent yield and it was revealed that position and number of substituents on acetophenones and aromatic aldehydes played a very crucial and key role in the construction
Microwave Enhanced Green Synthesis of 2-Pyrazolines, Isoxazolines and Cyclohexenones
作者:Abdullah S. Al-Bogami、Hamad Z. Alkhathlan、Tamer S. Saleh
DOI:10.14233/ajchem.2013.15070
日期:——
Hydroxy chalcones undergo simple cyclizations with phenylhydrazine to afford 2-pyrazolines under microwave irradiation in the presence of glacial AcOH as cyclizing agent, also undergo simple cyclizations with hydroxylamine to afford 2-isoxazolines under microwave irradiation in the presence of KOH, and new cyclohexenone derivatives. Some valuable intermediates in the synthesis of fused heterocycles, have been prepared through K2CO3 which activate the cyclocondensation of hydroxychalcones with ethyl acetoacetate. The obtained results indicate that the microwave irradiation give shorter reaction times and cleaner reactions for synthesis of biologically important compounds.