An easy and efficient route to obtain 2-amino-4,5-dihydrothiophenes is presented. A formal (3+2)-cycloaddition of donor–acceptor cyclopropanes and ammonium thiocyanate catalyzed by Yb(OTf)3 delivers the desired products in good to excellent yields. A broad range of functional groups is tolerated during this process.
提出了一种简单而有效的方法来获得2-
氨基-4,5-二氢
噻吩。由Yb(OTf)3催化的供体-受体
环丙烷和
硫氰酸铵的正式(3 + 2)-环加成反应可提供所需产物,且收率高至优异。在此过程中,可以容忍各种各样的官能团。