Synthesis of New 2-(5-Aryl-3-styryl-4,5-dihydro-1<i>H</i>-pyrazol-1-yl)-4-(trifluoromethyl)pyrimidines
作者:Alex Flores、Darlene Flores、Gabriela Fiss、Letícia Wbatuba、Marcos Martins、Robert Burrow
DOI:10.1055/s-2006-942431
日期:——
A series of 2-(5-aryl-3-styryl-4,5-dihydro-1H-pyrazol-1-yl)-4-(trifluoromethyl)pyrimidines was synthesized by the cyclocondensation of 5-aryl-1-carboxamidino-3-styryl-4,5-dihydro-1H-pyrazoles with 4-alkoxy-1,1,1-trifluoroalk-3-en-2-ones. Efficient cyclizations catalyzed by Ti(Oi-Pr)4 or BF3·OEt2 gave the desired pyrimidines in good yields. The crystal structure of ethyl 3-[2-(5-phenyl-3-styryl-4,5-dihydro-1H-pyrazol-1-yl)-4-(trifluoromethyl)pyrimidin-6-yl]propanoate was determined.
一系列2-(5-芳基-3-苯乙烯基-4,5-二氢-1H-吡唑-1-基)-4-(三氟甲基)嘧啶通过5-芳基-1-羧酰亚胺基-3-苯乙烯基-4,5-二氢-1H-吡唑与4-烷氧基-1,1,1-三氟-3-烯-2-酮的环化缩合反应合成。在Ti(Oi-Pr)4或BF3·OEt2的催化下,高效的环化反应以良好产率得到目标嘧啶。确定了乙基3-[2-(5-苯基-3-苯乙烯基-4,5-二氢-1H-吡唑-1-基)-4-(三氟甲基)嘧啶-6-基]丙酸酯的晶体结构。