Asymmetric construction of trifluoromethylated pyrrolidines via Cu(i)-catalyzed 1,3-dipolar cycloaddition of azomethine ylides with 4,4,4-trifluorocrotonates
作者:Qing-Hua Li、Min-Chao Tong、Jun Li、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1039/c1cc14295j
日期:——
Trifluoromethylated pyrrolidines have been synthesized viacatalytic asymmetric 1,3-dipolar cycloaddition with excellent stereoselectivity for the first time. Epimerization of the endo-pyrrolidines obtained from cis-4,4,4-trifluorocrotonate into the exo-pyrrolidines was also revealed.
三氟甲基化的吡咯烷类化合物首次通过催化不对称 1,3- 二极环加成法合成,并具有优异的立体选择性。此外,还发现了由顺式-4,4,4-三氟巴豆酸酯得到的内生吡咯烷类化合物与外生吡咯烷类化合物的外嵌化现象。