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。
通过CC键的裂解,提出了Morita-Baylis-Hillman C加合物的第一个催化串联共轭加成-消除反应。可以通过独家E 构型获得各种S N 2'-样C-,S-和P-烯丙基化合物,并具有良好或优异的收率。在相同的反应条件下,通过调节α-亚甲基酯的β-C-取代基也可以很容易地制备迈克尔产物。通过DFT方法计算的各种跃迁状态的相对能量有力地支持了所观察到的化学选择性和非对映选择性。
Through the cleavage of the CCbond, the first catalytictandemconjugateaddition–eliminationreaction of Morita–Baylis–HillmanCadducts has been presented. Various SN2′‐like C‐, S‐, and P‐allylic compounds could be obtained with exclusive E configuration in good to excellent yields. The Michael product could also be easily prepared by tuning the β‐C‐substituent group of the α‐methylene ester under
通过CC键的裂解,提出了Morita-Baylis-Hillman C加合物的第一个催化串联共轭加成-消除反应。可以通过独家E 构型获得各种S N 2'-样C-,S-和P-烯丙基化合物,并具有良好或优异的收率。在相同的反应条件下,通过调节α-亚甲基酯的β-C-取代基也可以很容易地制备迈克尔产物。通过DFT方法计算的各种跃迁状态的相对能量有力地支持了所观察到的化学选择性和非对映选择性。
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 cyclizationfrom 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。