Synthesis of N-tosyl-3,3,4-trisubstituted pyrrolidine derivatives starting from the Baylis–Hillman adducts via radical cyclization
作者:Hyun Seung Lee、Hoo Sook Kim、Jeong Mi Kim、Jae Nyoung Kim
DOI:10.1016/j.tet.2008.01.001
日期:2008.3
N-Tosyl-3,3-disubstituted-4-vinylpyrrolidine derivatives 3a–c were synthesized via radical cyclization from the modified Baylis–Hillman adducts 2. The required starting materials 2a–c were prepared in moderate yields from the Baylis–Hillman adducts in three steps: (i) acetylation of the Baylis–Hillman adducts, (ii) SN2′ reaction with tosylamide to prepare 1, and (iii) alkylation with 1,4-dibromo-2-butene
N -Tosyl-3,3-dipropyl-4-vinylpyrrolidine衍生物3a – c是通过自由基环化反应从修饰的Baylis–Hillman加合物2合成的。所需的起始原料2a – c通过以下三个步骤从Baylis–Hillman加合物以中等收率制备:(i)Baylis–Hillman加合物的乙酰化;(ii)S N 2'与甲苯磺酰胺反应制备1,和(iii )用1,4-二溴-2-丁烯进行烷基化。