作者:Imanzadeh Gholamhassan、Hooshmand Hemayat
DOI:10.2174/1570178612666150725000236
日期:2015.10.6
A new series of 1,2-disubstituted 4-phenylurazoles have been synthesized with aza-Michael
addition of 4-phenylurazole and different acrylic esters. It was found that, without basic media, no
reaction took place and the reactions proceeded easily in tetrabutylammonium bromide (TBAB), an
ionic organic salt, under solvent-free conditions. The reactions were performed efficiently using 1,4-
diaza-bicyclo[2,2,2]octane (DABCO), as an inexpensive base, at 60°C and produced the desired
Michael adducts in good yields within 30-40 min. Surprisingly, no mono-Michael adducts were produced and bis-michael
adducts were the only products of the reactions.
通过 4-苯基脲唑与不同丙烯酸酯的偶氮迈克尔加成反应,合成了一系列新的 1,2-二取代 4-苯基脲唑。研究发现,在无溶剂条件下,如果没有碱性介质,反应不会发生,而在四丁基溴化铵(TBAB)(一种离子有机盐)中,反应则很容易进行。使用 1,4-重氮双环[2,2,2]辛烷(DABCO)作为廉价碱,在 60°C 温度下高效地进行了反应,并在 30-40 分钟内以良好的收率生成了所需的迈克尔加合物。令人惊讶的是,反应中没有产生单迈克尔加合物,只有双迈克尔加合物。