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
preparation of substitutedlinearenediyneesters bearing the double bond either at the terminal or at internal position and the ester substituent either at the alkyne or at the alkene terminus is presented. Their cobalt(I)-mediated [2+2+2] cyclizations produce the η4-complexed tricyclic compounds in very good yields. The endo/exo selectivity depends on the position of the ester in the enediyne, but the
Improvement of the diastereoselectivity of the cobalt-mediated [2+2+2] cycloaddition of substituted linear enediynes
作者:Franck Slowinski、Corinne Aubert、Max Malacria
DOI:10.1016/s0040-4039(98)02483-6
日期:1999.1
The level of the diastereoselectivity of the cobalt-mediated [2+2+2] cyclization of linearenediynes was improved compared to that reported in the literature by substituting the triple or the double bond with ester, phosphine oxide or sulfoxide groups.
Intramolecular cobalt-mediated [2 + 2 + 2] cycloaddition of linear enediynes. A useful synthetic entry into cobalt-protected tricyclic dienes and their synthetic elaboration