Synthesis and Reactivity of Fusion Product of 2-Methylthiazole Fragment to 2-(Furan-2-yl)benzimidazole
作者:M. M. Elchaninov、A. A. Aleksandrov
DOI:10.1134/s1070428018080134
日期:2018.8
the corresponding thioamide. The latter was oxidized with K3[Fe(CN)6] in alkaline environment to obtain 2,8-dimethyl-7-(furan-2-yl)-8H-imidazo[4,5-g][1,3]benzothiazole. Its reactions of electrophilic substitution were studied: nitration, bromination, sulfonation, formylation, acylation. The substituent is introduced exclusively in the position 5 of the furan ring.
在硫酸铜存在下,1,2-二氨基-4-硝基苯与呋喃-2-甲醛反应,得到2-(呋喃-2-基)-5(6)-硝基-1 H-苯并咪唑。其N-甲基化提供了1-甲基-5(6)-硝基异构体。用锡浓溶液还原异构体后。HCl得到纯的3-甲基-2-(呋喃-2-基)苯并咪唑-5-胺。该胺与乙酸酐的缩合导致形成N- [3-甲基-2-(呋喃-2-基)苯并咪唑-5-基]乙酰胺,其在无水吡啶中用过量的P 2 S 5处理可得到相应的硫代酰胺。后者在碱性环境下用K 3 [Fe(CN)6 ]氧化,得到2,8-二甲基-7-(呋喃-2-基)-8H-咪唑并[4,5- g ] [1,3]苯并噻唑。研究了其亲电取代反应:硝化,溴化,磺化,甲酰化,酰化。取代基仅引入呋喃环的5位。