作者:Yong He、Yingzhong Chen、Hongwang Du、Lesley A Schmid、Carl J Lovely
DOI:10.1016/j.tetlet.2004.05.011
日期:2004.7
An efficient method for the regioselective protection of 4-alkyl-, 4-iodo, 4-vinylimidazoles has been developed via an alkylation–isomerization sequence with various imidazole-protecting groups. The initially formed mixture of 4/5-alkyl-, 4/5-iodo, and 4/5-vinylimidazoles are isomerized to the corresponding 4-isomers on treatment of a DMF solution with a small amount of RX and heating at 75 °C.
通过具有各种咪唑保护基的烷基化-异构化序列,已经开发出一种有效的区域选择性保护4-烷基-,4-碘,4-乙烯基咪唑的方法。在用少量RX处理DMF溶液并在75°C加热的情况下,将最初形成的4 / 5-烷基-,4 / 5-碘和4 / 5-乙烯基咪唑的混合物异构化为相应的4-异构体。