Highly stereoselective induction in the cobalt-mediated [2+2+2] cycloaddition of chiral phosphine oxides substituted linear enediynes
作者:Franck Slowinski、Corinne Aubert、Max Malacria
DOI:10.1016/s0040-4039(99)01137-5
日期:1999.8
The cobalt(I)-catalyzed highly stereoselective [2+2+2] cyclization has been realized for the first time with chiral phosphine oxides substitutedlinearenediynes. Depending the substituents on the phosphorus atom, the cycloaddition was achieved with a level of diastereoselectivity of 74%.
Diastereoselective Cobalt-Mediated [2 + 2 + 2] Cycloadditions of Substituted Linear Enediynes Phosphine Oxides: Scope and Limitations
作者:Franck Slowinski、Corinne Aubert、Max Malacria
DOI:10.1021/jo026212r
日期:2003.1.1
Variously substitutedlinearenediynes phosphines oxides possessing the double bond at either the terminal or internal position and with the phosphine oxide appended onto the alkyne or the alkene terminus have been prepared. Their cobalt(I)-mediated cyclizations produce the eta(4)-complexed tricyclic compounds in high yields. The endo/exo selectivity depends on both the position of the phosphine oxide