Modular ligands in asymmetric synthesis. Copper-mediated cyclopropanation
作者:Dora Tepfenhart、Lionel Moisan、Peter I. Dalko、Janine Cossy
DOI:10.1016/j.tetlet.2003.12.061
日期:2004.2
mediates asymmetric intermolecular cyclopropanations. Complexes derived from (R,R)- or (S,S)-1,1-diphenylethylenediamine, cyclic ketones, and Cu(I) or Cu(II) triflates were compared. The reaction between (−)-menthyl diazoacetate and 1,1-diphenylethylene affords cyclopropane carboxylates in up to 80% yield and with up to 78% de.
手性咪唑啉/铜催化剂体系有效地介导了不对称的分子间环丙烷化。比较了衍生自(R,R)-或(S,S)-1,1-二苯基乙二胺,环酮和Cu(I)或Cu(II)三氟甲磺酸酯的配合物。(-)-薄荷基重氮乙酸酯与1,1-二苯基乙烯之间的反应以高达80%的收率和高达78%的de产率提供环丙烷羧酸酯。