作者:Brigita Vigante、Martins Rucins、Aiva Plotniece、Karlis Pajuste、Iveta Luntena、Brigita Cekavicus、Egils Bisenieks、Rufus Smits、Gunars Duburs、Arkadij Sobolev
DOI:10.3390/molecules201119697
日期:——
ethoxycarbonylmethyl esters of 1,4-dihydropyridines were directly converted into carbamoylmethyl esters in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) in good to excellent yields under mild conditions. The use of TBD is crucial for the successful aminolysis of ethoxycarbonylmethyl ester of 1,4-dihydropyridines with secondary amines as without it the reaction does not proceed at all. The aminolysis reaction
在温和条件下,在 1,5,7-三氮杂双环 [4.4.0]dec-5-烯 (TBD) 存在下,1,4-二氢吡啶的乙氧基羰基甲酯直接转化为氨基甲酰基甲酯,产率良好至极好。TBD 的使用对于 1,4-二氢吡啶的乙氧基羰基甲酯与仲胺的成功氨解至关重要,因为没有它,反应根本不会进行。氨解反应区域选择性地进行,因为与 1,4-二氢吡啶循环共轭的烷基酯不参与反应。筛选其他含氮碱,如三乙胺 (TEA)、吡啶、4-(N,N-二甲氨基)吡啶 (DMAP)、1,8-二氮杂双环[5.4.0]十一碳烯 (DBU)、 1,5-二氮杂双环[4.3.0]非5-烯(DBN)、咪唑、四甲基胍(TMG)和7-甲基-1,5,7-三氮杂双环[4.4。