synthesized by highly enantioselective Fesulphos-Cu-catalyzed 1,3-dipolar cycloaddition of azomethine ylides with trans-1,2-bisphenylsulfonyl ethylene, followed by reductive sulfonyl elimination. High levels of reactivity, exoselectivity, and enantioselectivity have been accomplished for a variety of substituted azomethine ylides. This cycloaddition-desulfonylation strategy has been applied as a key step in the
对映体富集的
3-吡咯啉是通过高对映选择性 Fesulphos-Cu 催化的偶氮甲碱叶立德与反式-1,2-双苯磺酰基
乙烯的 1,3-偶极环加成,然后进行还原性磺酰基消除来合成的。各种取代的偶氮甲碱叶立德已经实现了高
水平的反应性、外选择性和对映选择性。这种环加成-脱磺酰化策略已被用作对映选择性合成具有
生物活性的 C-氮杂核苷的关键步骤。