About the intermediacy of 1,2-dihydroquinazolinium salts in the Friedländer–Borsche synthesis of quinolinium salts in acidic medium
摘要:
Spontaneously or under various heating conditions, 2-alkyl- or 2-aryl-(iminoalkyl)benzenamines react with ketones and triflic acid (1:1:1) to give quinolinium salts. When working under milder thermal conditions, intermediate 1,2-dihydroquinazolinium derivatives can be isolated or detected in solution but decompose upon standing or heating to give the corresponding quinolinium salts. (C) 2011 Elsevier Ltd. All rights reserved.
About the intermediacy of 1,2-dihydroquinazolinium salts in the Friedländer–Borsche synthesis of quinolinium salts in acidic medium
摘要:
Spontaneously or under various heating conditions, 2-alkyl- or 2-aryl-(iminoalkyl)benzenamines react with ketones and triflic acid (1:1:1) to give quinolinium salts. When working under milder thermal conditions, intermediate 1,2-dihydroquinazolinium derivatives can be isolated or detected in solution but decompose upon standing or heating to give the corresponding quinolinium salts. (C) 2011 Elsevier Ltd. All rights reserved.