丙醛在手性二胺(S,S)-N - i Pr-2,2'-联吡咯烷的催化下,丙醛向(2 E)-(3-硝基-丁-2-烯氧基甲基)-苯8的不对称迈克尔加成,获得了93%ee的(-)-botryodiplodin的前体9。经由Nef反应将9的硝基官能团转化为酮,从而在几步后得到对映体富集的(-)-botododiplodin。
丙醛在手性二胺(S,S)-N - i Pr-2,2'-联吡咯烷的催化下,丙醛向(2 E)-(3-硝基-丁-2-烯氧基甲基)-苯8的不对称迈克尔加成,获得了93%ee的(-)-botryodiplodin的前体9。经由Nef反应将9的硝基官能团转化为酮,从而在几步后得到对映体富集的(-)-botododiplodin。
Trisubstituted alkenes with a single activator as dipolarophiles in a highly diastereo- and enantioselective [3+2] cycloaddition with vinyl epoxides under Pd-catalysis
which are unreactive electron-deficient alkenes in transition metal-catalyzed [3+2] cycloaddition with vinyl three-membered heterocycles, were used in the Pd-catalyzed asymmetric cycloaddition of vinyl epoxides, affording multifunctionalized tetrahydrofurans in high yields with high diastereo- and enantioselectivities.