C2-symmetric 5-aza-semicorrins are readily prepared in enantiomerically pure form starting from pyroglutamic acid. Methylation at N(5) leads to neutral bidentate nitrogen ligands. Copper(I) and palladium(II) complexes of these ligands have proved to be efficient enantioselective catalysts for the cyclopropanation of olefins and for allylic nucleophilic substitutions.
                                    C 2对称的5-氮杂-半corrins很容易从焦谷
氨酸开始以对映体纯的形式制备。N(5)处的甲基化导致中性双齿氮
配体。这些
配体的
铜(I)和
钯(II)配合物已被证明是用于烯烃
环丙烷化和烯丙基亲核取代的有效对映选择性催化剂。