Synthesis of 2,2,2-trifluoroethyl 1H-pyrazole carboxylates: Insight into the mechanism of trichloromethyl group hydrolysis
作者:Helena A. Gonçalves、Bruna A. Pereira、Wystan K.O. Teixeira、Sidnei Moura、Darlene C. Flores、Alex F.C. Flores
DOI:10.1016/j.jfluchem.2016.05.009
日期:2016.7
one-pot synthesis of 2,2,2-trifluoroethyl 1H-pyrazole-5(3)-carboxylates via cyclocondensation of 1,1,1-trichloro-4-alkoxy-3-alken-2-ones [Cl3CC(O)C(R2) = C(R1)OMe, where R1 = H, CH3, n-octyl, n-nonyl, n-decyl, n-undecyl, n-tridecyl, −(CH2)2Ph, 4-ClC6H4, 4-BrC6H4 and R2 = H] and 1,1,1-trichloro-2,4-alkanediones, 1-aryl-4,4,4-trichloro-1,3-butanediones [Cl3CC(O)CHR2C(O)R1, where R1 = H, CH3, −(CH2)2Ph
本文报道了通过1,1,1-三氯-4-烷氧基-3-烯烃-2-酮的环缩合反应一锅法合成2,2,2-三氟乙基1H-吡唑-5(3)-羧酸盐[Cl 3 CC(O)C(R 2)= C(R 1)OME,其中R 1 = H,CH 3,ñ辛基,ñ壬基,ñ癸基,ñ -十一烷基,正-十三烷基, - (CH 2)2 Ph,4-ClC 6 H 4,4 -BrC 6 H 4和R 2 = H]和1,1,1-三氯-2,4-烷二酮,1-芳基-4,4,4-三氯- 1,3-丁二酮[Cl3 CC(O)CHR 2 C(O)R 1,其中R 1 = H,CH 3, - (CH 2)2 PH,PH,4-FC 6 H ^ 4 , 4- BRC 6 ħ 4,R 2 = H,R 1 = Ph,R 2 = CH 3,R 1,R 2 =环-(CH 2)5-]与盐酸肼在2,2,2-三氟乙醇(TFE)中的混合。考虑到TFE相对于甲醇或乙醇的低亲核性,该结果为连接在1