185815-59-2
185815-59-2 结构式
基本信息
3-异丁基戊二酸酐
Pregabalin Pyrandione IMP
3-isobutylglutaric anhydride
Pregabalin Pyrandione Impurity
4-(2-methylpropyl)oxane-2,6-dione
4-isobutyl-dihydro-3H-pyran-2,6-dione
4-Isobutyldihydro-2H-pyran-2,6(3H)-dione
3-isobutylglutaric anhydride ISO 9001:2015 REACH
Dihydro-4-(2-methylpropyl)-2H-pyran-2,6(3H)-dione
2H-Pyran-2,6(3H)-dione,dihydro-4-(2-Methylpropyl)-
制备方法
75143-89-4
185815-59-2
以3-异丁基戊二酸为原料合成4-异丁基二氢-2H-吡喃-2,6(3H)-二酮的一般步骤:将3-异丁基戊二酸(50g,266mmol)溶于丙酸酐(130ml)中,反应混合物于140-145℃加热回流6小时。反应完成后,通过减压蒸馏(30-60℃/15mm Hg)除去丙酸和未反应的丙酸酐。随后,在100-105℃/0.5mm Hg下收集产物,得到黄色油状物4-异丁基二氢-2H-吡喃-2,6(3H)-二酮,产量41g(收率91%),GC纯度>98%(HP-1,25m,70kPa,梯度70-240℃,15℃/min)。产物结构经1H NMR(CDCl3)和13C NMR(CDCl3)确认:1H NMR(CDCl3),δ/ppm:0.91(d,6H,J=6.6Hz),1.27(t,2H,J=7.1Hz),1.61-1.75(m,1H),2.12-2.50(m,3H),2.85(dd,2H,J1=17Hz,J2=4.1Hz);13C NMR(CDCl3),δ/ppm:21.86,24.23,25.89,35.43,43.08,166.48。
参考文献:
[1] Patent: WO2008/9897, 2008, A1. Location in patent: Page/Page column 8-9
[2] Patent: WO2012/93411, 2012, A2. Location in patent: Page/Page column 18
[3] Journal of the Chemical Society, 1954, p. 516,519
[4] Patent: WO2007/35789, 2007, A1. Location in patent: Page/Page column 30
[5] Patent: WO2009/4643, 2009, A2. Location in patent: Page/Page column 26
