A New One-Step Synthesis of 1,2,4-Triazino[2,3-c]quinazolines
作者:Oleksandr V. Karpenko、Sergiy I. Kovalenko、Oleksiy O. Chekotylo、Svitlana V. Shishkina
DOI:10.3987/com-06-10971
日期:——
A new and efficient one-step protocol for the synthesis of 3-substituted 2H-l,2,4-triazino[2,3-c]quinazolin-2-ones (5) was developed starting from 4-hydrazinoquinazoline (1) and α-ketocarboxylic acids and their esters. Corresponding hydrazones (2a,c and 3a,c,e) were isolated as intermediate products. Further cyclocondensation followed by acid-catalyzed Dimroth rearrangement resulted in the title derivatives