Termal rearrangement of 1-alkyl-3,6-diaryl-1,4-dihydro-s-tetrazines to 1-alkylamino-3,5-diaryl-1,2,4-triazoles
作者:Daniel Hunter、Douglas G. Neilson
DOI:10.1039/p19840002779
日期:——
having aryl substituents in either the 3- or 3,6-positions react readily with alkyl or aryl Grignard reagents to give 1-alkyl (or aryl)-1,4-dihydro-s-tetrazines. The 1-alkyl-1,4-dihydro-s-tetrazines rearrange in methanolic hydrogen chloride to 4-alkylamino-1,2,4-triazoles, but thermolyse readily to the less well known, isomeric 1-alkylamino-1,2,4-triazoles. Possible reaction pathways involving breakdown
FACILE PREPARATION OF 4-SUBSTITUTED QUINAZOLINES AND RELATED HETEROCYCLES
申请人:Wang Zerong Daniel
公开号:US20120283436A1
公开(公告)日:2012-11-08
A straightforward single step method for the preparation and/or production of substituted quinazolines is disclosed, wherein said quinazolines preferably contain one substituent at position 4, and may contain other functional groups at various positions, such as 5, 6, 7, and/or 8 of quinazolines. In addition, the extension of this new method leads to the formation of different type of heterocyclic aromatic compounds, that include but are not limited to perimidines, anthrapyrimidin-7-ones (also known as anthrapyrimidinones), anthra[1,9:5,10]dipyrimidines (also known as quinazoline[5,4-ef]perimidines) and benzo[e]-pyrimido[4,5,6-gh]pyrimidines.