the presence of tert-butylamine and catalytic amounts of bismuth(III) triflate. The mechanism is believed to involve formation of an imidazoline intermediate, followed by the methyl group migration, and subsequent aromatization to the imidazole ring.
Sonochemical synthesis of novel pyrano[3,4-e][1,3]oxazines: A green protocol
作者:Tamer S. Saleh、Abdullah S. Al-Bogami、Ahmed E.M. Mekky、Hamad Z. Alkhathlan
DOI:10.1016/j.ultsonch.2016.12.015
日期:2017.5
The atom-efficient and green protocol for formation of pyrano[3,4-e][1,3]oxazines utilizing dimethyl carbonate under ultrasound irradiation in a presence of KF/basic alumina was reported. We provide a novel series of pyrano[3,4-e][1,3]oxazine derivatives interesting for biological screening tests. In general, it was found that ultrasound irradiations enable the reactions to occur which could not be
A novel and convenient synthesis of 4-hydroxy-6-methyl-3-(1-(phenylimino) ethyl)-2H-pyran-2-one derivatives under ultrasound irradiation
作者:Huiyan Wang、Yi Zou、Xuan Zhao、Daqing Shi
DOI:10.1016/j.ultsonch.2011.01.006
日期:2011.9
A facile, efficient and environment-friendly protocol for the synthesis of 4-hydroxy-6-methyl-3-(1-(phenylimino)ethyl)-2H-pyran-2-one derivatives has been developed by the convenient ultrasound-mediated condensation of amine with dehydroacetic acid. This method provides several advantages over current reaction methodologies including a simple work-up procedure, shorter reaction times and higher yields