Phosphine-free Direct Conversion of Carboxylic Acids into Acyl Isothiocyanates Using Various Electrophilic Halogenation Reagents
作者:Aslan Khaje-Kolaki、Babak Mokhtari
DOI:10.2174/1570178615666180330155606
日期:2018.7.26
In this study, the efficiency of some electrophilic halogen reagents including 2,4,6-trichloro-
1,3,5-triazine, 2,4,4,6-tetrabromo-2,5-cyclohexadienone, 2-chloro-1-methylpyridinium iodide, Nbromosuccinimide,
trichloroisocyanuric acid, and 1,3-dibromo-5,5-dimethylhydantoin for the direct
phosphine-free conversion of carboxylic acids into the corresponding acyl isothiocyanates was investigated.
All of the reagents work well for this transformation, but, the best results were obtained when
cyanuric chloride in the presence of pyridine was used at room temperature.
在这项研究中,一些亲电卤素试剂(包括 2,4,6- 三氯-1,3,5-三嗪、2,4,4,6-四溴-2,5-环己二烯酮、2-氯-1-甲基吡啶鎓碘化物、溴代琥珀酰亚胺、三氯异氰尿酸和 1,3-二溴-5,5-二甲基海因)在将羧酸直接无磷转化为相应的酰基异硫氰酸时的效率、
三氯异氰尿酸和 1,3-二溴-5,5-二甲基海因,用于将羧酸直接无磷转化为相应的酰基异硫氰酸酯。
所有试剂都能很好地进行这种转化,但在室温下使用有吡啶存在的三聚氯氰效果最好。