Cobalt-based catalysts for the cyclization of alkenes
申请人:Zhang Peter X.
公开号:US20060030718A1
公开(公告)日:2006-02-09
Metal-ligand complexes, including cobalt-ligand complexes, such as a cobalt-porphyrin complex, and their use as catalysts in the cyclization of alkenes.
金属配合物,包括钴配体配合物,如钴卟啉配合物,以及它们在烯烃环化反应中作为催化剂的使用。
Cobalt-Catalyzed Aziridination with Diphenylphosphoryl Azide (DPPA): Direct Synthesis of <i>N</i>-Phosphorus-Substituted Aziridines from Alkenes
作者:Guang-Yao Gao、Jess E. Jones、Renu Vyas、Jeremiah D. Harden、X. Peter Zhang
DOI:10.1021/jo0609226
日期:2006.8.1
A new catalytic aziridination system that consists of cobalt (II) tetraphenylporphyrin [Co(TPP)] as the catalyst and diphenylphosphoryl azide ( DPPA) as the nitrene source has been developed. The cobalt-based catalytic system allows direct synthesis of N-phosphorus-substituted aziridines from alkenes with dinitrogen as the byproduct. Cobalt ion seems essential to the catalytic aziridination with DPPA as no or only trace amounts of the desired products were observed with other metal complexes of tetraphenylporphyrin.
Cobalt-Catalyzed Asymmetric Olefin Aziridination with Diphenylphosphoryl Azide
作者:Jess E. Jones、Joshua V. Ruppel、Guang-Yao Gao、Thomas M. Moore、X. Peter Zhang
DOI:10.1021/jo801151x
日期:2008.9.19
The cobalt(II) complexes of D2-symmetric chiral porphyrins, such as 3,5-Di(t)Bu-ChenPhyrin P5, can catalyze asymmetric olefinaziridination with diphenylphosphoryl azide (DPPA) as a nitrene source. Acceptable asymmetric inductions were observed for the [Co(P5)]-based catalytic system, forming the desired N-phosphorus-substituted aziridines in moderate to high yields and good enantioselectivities.