A fast one: The title reaction proceeds in the presence of 5 mol % of the catalyst 1, and is complete within an hour. The 2‐alkyl‐ and 2‐aryl‐substituted 3‐pyrroline products are obtained in good yield and with high enantioselectivity. The application of the method to the concise formal synthesis of (+)‐trachelanthamidine is also demonstrated. Boc=tert‐butoxycarbonyl, M.S.=molecular sieves, TBDPS=
快速反应:标题反应在5摩尔%的催化剂1的存在下进行,并在一小时内完成。以高收率和高对映选择性获得2-烷基和2-芳基取代的
3-吡咯啉产物。还证明了该方法在简明形式的(+)-trachelanthamidine合成中的应用。Boc =叔丁氧羰基,MS =
分子筛,T
BDPS =叔丁基二苯基甲
硅烷基。