1 bearing an amino group protected by an electron-withdrawing group were smoothly cyclized to 2-(silylmethyl)pyrrolidines 2. This cyclization was utilized for the stereoselective synthesis of 2,n-disubstituted pyrrolidines (n = 3-5). The cyclized products could be converted to the corresponding alcohols by oxidative cleavage of the carbon-silicon bond with TBAF and H2O2.
[反应:见正文]在酸催化剂的存在下,将带有被吸电子基团保护的
氨基的
乙烯基硅烷1平滑环化为2-(甲
硅烷基甲基)
吡咯烷2。该环化反应用于2的立体选择性合成正二取代的
吡咯烷(n = 3-5)。通过用TBAF和H 2 O 2氧化碳-
硅键,可以将环化产物转化为相应的醇。