Highly Asymmetric Intramolecular Cyclopropanation of Acceptor-Substituted Diazoacetates by Co(II)-Based Metalloradical Catalysis: Iterative Approach for Development of New-Generation Catalysts
作者:Xue Xu、Hongjian Lu、Joshua V. Ruppel、Xin Cui、Silke Lopez de Mesa、Lukasz Wojtas、X. Peter Zhang
DOI:10.1021/ja2062506
日期:2011.10.5
Co(II)-catalyzed asymmetriccyclopropanation of alkenes. The Co(II) complex of 3,5-Di(t)Bu-QingPhyrin, [Co(P2)], has proved to be a general and effective catalyst for asymmetricintramolecularcyclopropanation of various allylic diazoacetates (especially including those with α-acceptor substituents) in high yields with excellent stereoselectivities. The [Co(P2)]-based intramolecular metalloradical cyclopropanation
Hueckel, W., Nachrichten der Akademie der Wissenschaften in Goettingen, Mathematisch-Physikalische Klasse, 2A: Mathematisch-Physikalisch-Chemische Abteilung, 1946, vol. IIa, p. 36 - 37