作者:Paul G Bulger、Ian F Cottrell、Cameron J Cowden、Antony J Davies、Ulf-H Dolling
DOI:10.1016/s0040-4039(99)02272-8
日期:2000.2
The alkylation of 1,2,4-triazole with 4-nitrobenzyl halides and a variety of bases afforded the 1- and 4-alkylated isomers with a consistent regioselectivity of 90:10. Previously reported regiospecific alkylations of 1,2,4-triazole were re-examined and the quoted isomer ratios were shown to depend on the isolation procedure. The use of DBU as base in the alkylation of 1,2,4-triazole allows for a convenient and high yielding synthesis of 1-substituted-1,2,4-triazoles. (C) 2000 Elsevier Science Ltd. All rights reserved.