Bis-Sulfonyl Ethylene as Masked Acetylene Equivalent in Catalytic Asymmetric [3 + 2] Cycloaddition of Azomethine Ylides
作者:Ana López-Pérez、Javier Adrio、Juan C. Carretero
DOI:10.1021/ja804021m
日期:2008.8.1
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。