2-(N,N-disubstituted amino)thiazoles with electron-withdrawing groups at position 5: preparation and investigation of structural features
作者:Timothy N. Birkinshaw、David W. Gillon、Shaun A. Harkin、G. Denis Meakins、Malcom D. Tirel
DOI:10.1039/p19840000147
日期:——
N-mono- and N,N-di-substituted cyanamides from cyanogen bromide has been developed. N,N-Disubstituted thioureas, obtained from the cyanamides, were condensed with α-bromo-α-cyano-ketones to give 5-cyano-2-(N,N-disubstituted amino)thiazoles and with α-bromo-ketones to give 2-(N,N-disubstituted amino)thiazoles. Substitution in the latter products afforded 5-trifluoroacetyl- and 5-nitro-2-(N,N-disubsti
已经开发了一种从溴化氰制备N-单和N,N-二取代的氰酰胺的简便方法。将由氰酰胺获得的N,N-二取代硫脲与α-溴-α-氰基酮缩合,得到5-氰基-2-(N,N-二取代氨基)噻唑和与α-溴酮缩合2-(N,N-二取代的氨基)噻唑。用后者的产物取代,得到5-三氟乙酰基和5-硝基-2-(N,N-二取代氨基)噻唑。4-芳基的存在极大地促进了硝化反应。