Regiospecific one-pot synthesis of new trifluoromethyl substituted heteroaryl pyrazolyl ketones
作者:Helio G. Bonacorso、Marli R. Oliveira、Michelle B. Costa、Letícia B. Da Silva、Arci D. Wastowski、Nilo Zanatta、Marcos A. P. Martins
DOI:10.1002/jhet.5570420424
日期:2005.5
A convenient and general method for the regiospecific synthesis of three novel series of 1-(2-thenoyl)-, 1-(2-furoyl)- and 1-(isonicotinoyl)-3-alkyl(aryl)-5-hydroxy-5-trifluoromethyl-4,5-dihydro-1H-pyrazoles, in good yields (53 – 91 %), from the cyclocondensation reactions of 1,1,1-trifluoro-4-alkoxy-4-alkyl(aryl)-but-3-en-2-ones, where alkyl = H and Me; aryl = -C6H5, 4-CH3C6H4, 4-CH3OC6H4, 4-FC6H4
一种方便且通用的方法,用于区域特异性合成三个新的1-(2-thenoyl)-,1-(2-furoyl)-和1-(异烟酰酰基)-3-烷基(芳基)-5-羟基-5系列-三氟甲基-4,5-二氢-1 H-吡唑类化合物,通过1,1,1-三氟-4-烷氧基-4-烷基(芳基)-但-的环缩合反应收率很好(53 – 91%) 3-烯-2-酮,其中烷基= H和Me;芳= -C 6 H ^ 5,4-CH 3 C ^ 6 ħ 4,4-CH 3 OC 6 H ^ 4,4-FC 6 H ^ 4,4-CLC 6 ħ 4,4- BRC 6 ħ 4,4-NO 2 CgH4与2-噻吩酰肼,酰肼糠和异烟酸酰肼,分别报告。随后,苯基取代的2-吡唑啉与P 2 O 5脱水反应,以区域异构体的混合物形式提供了相应的1 H-吡唑类,产率低(35%-36%)。