Synthetic studies on 4,5-dihydro-3H-1,2,4-triazole-3,5-diones bearing fluorogenic residues at N-4
作者:Gordon Read、Nigel R. Richardson
DOI:10.1039/p19960000167
日期:——
A number of fluorescent 4,5-dihydro-3H-1,2,4-triazole-3,5-diones have been made. Intra-inter-electrophilic substitution by the triazoledione moiety on the activated naphthalene ring of 4-[6-(5-dimethylamino-1-naphthylsulfonamido)hexyl]-4,5-dihydro-3H-1,2,4-triazole-3,5-dione 4a3 leads to rapid decomposition. The dienophilicity of the triazoledione moiety in 4-pyren-1-yl-4,5-dihydro-3H-1,2,4-triazole-3,5-dione 4d is dramatically lowered by steric shielding. Insertion of a three-carbon spacer unit into the latter compound, to give the 3-pyren-1-ylpropyl analogue 4e, affords a valuable fluorogenic reagent for the analysis of trace levels of 1,3-dienes. Powdered barium manganate is shown to be an excellent solid-phase oxidant for conversion of urazoles into 1,2,4-triazole-3,5-diones.
已经合成了一些荧光的4,5-二氢-3H-1,2,4-三唑-3,5-二酮。在4-[6-(5-二甲氨基-1-萘磺酰胺)己基]-4,5-二氢-3H-1,2,4-三唑-3,5-二酮4a3的活化萘环上,三唑二酮基团的内外电亲核取代反应导致快速分解。4-芘-1-基-4,5-二氢-3H-1,2,4-三唑-3,5-二酮4d中的三唑二酮基团的二烯亲和性因空间位阻而显著降低。在后者化合物中插入一个三碳间隔单元,生成3-芘-1-基丙基类似物4e,为分析微量1,3-二烯提供了一种有价值的荧光试剂。粉末状锰酸钡被证明是一种优良的固相氧化剂,可以使尿唑转化为1,2,4-三唑-3,5-二酮。