Synthesis of 2-(3-hydroxy-2-methyl-1-alkenyl)-1-pyrrolines and 2-(3-hydroxybutyl)-1-pyrroline using α-lithiated 2-methyl-1-pyrroline
作者:Matthias D'hooghe、Kourosch Abbaspour Tehrani、Norbert De Kimpe
DOI:10.1016/j.tet.2009.02.050
日期:2009.5
demonstrated by immediate reductive epoxide ring opening utilizing lithium aluminium hydride in diethyl ether. Furthermore, 2-(3-oxobutyl)-1-pyrroline was prepared via an alternative approach through alkylation of 2-methyl-1-pyrroline with 3-chloro-2-(methoxymethyloxy)-1-propene using LDA in THF, followed by acid hydrolysis. Reduction of 2-(3-oxobutyl)-1-pyrroline by sodium borohydride in methanol afforded
使用LDA在THF中将2-甲基-1-吡咯啉与氯丙酮或3-氯-2-丁酮缩合,通过特殊的反应机理提供了新型的2-(3-羟基-2-甲基-1-烯基)-1-吡咯啉预期的2-(3-氧代丁基)-1-吡咯啉。在后一转化中2-(2,3-环氧-2-甲基烷基)-1-吡咯啉的中间体通过在乙醚中使用氢化铝锂的立即还原性环氧开环来证明。此外,通过另一方法通过使用在THF中的LDA,将2-甲基-1-吡咯啉与3-氯-2-(甲氧基甲基氧基)-1-丙烯烷基化,来制备2-(3-氧代丁基)-1-吡咯啉,然后酸水解。在甲醇中用硼氢化钠还原2-(3-氧丁基)-1-吡咯啉,得到相应的2-(3-羟基丁基)-1-吡咯啉,收率很高。