Studies on Quinazolines. 11. Intramolecular Imidate-Amide Rearrangement of 2-Substituted 4-(ω-Chloroalkoxy)quinazoline Derivatives. 1,3 -O → N Shift of Chloroalkyl Groups via Cyclic 1,3-Azaoxonium Intermediates
作者:Grace Shiahuy Chen、Shivaramayya Kalchar、Chun-Wei Kuo、Chih-Shiang Chang、Cyril O. Usifoh、Ji-Wang Chern
DOI:10.1021/jo0263420
日期:2003.3.1
The omega-chloroalkylation of 2-substituted quinazolin-4(3H)-one derivatives 1 and 2 with Br-(CH(2))(n)-Cl (n = 2-4) and the intramolecular imidate-amide rearrangement of the alkylated products are described. At room temperature, the 2-phenyl substituent promoted O-alkylation, whereas the less steric 2-benzyl group led to a higher ratio of N-alkylation. The investigation of the O-alkylated products