Nicholas Reactions in the Synthesis of Dicobalt Dibenzocyclooctyne Complexes
摘要:
Hexacarbonyldicobalt complexes of biaryl-substituted 4-methoxybutynones and 4-methoxy-2-butynes undergo intramolecular Nicholas reactions to form dibenzocyclooctyne-Co-2(CO)(6) complexes in good yields. Reductive decomplexation of the cyclization products is possible, and the method has been applied to a formal synthesis of isoschizandrin.
Asymmetric total synthesis of dibenzocyclooctadiene lignans (-)-schizandrin and (-)-isoschizandrin. Structure revision of (+)-isoschizandrin
作者:Alan M. Warshawsky、A. I. Meyers
DOI:10.1021/ja00178a037
日期:1990.10
The oxazoline-mediated biaryl coupling reaction was applied successfully to the totalsynthesis of a series of dibenzocyclooctadiene lignans in chiral nonracemic form. The diastereoselectivities achieved in the coupling reaction varied in a predictable manner, primarily as a function of the ortho substituents on the phenyl Grignard reagent
Nicholas Reactions in the Synthesis of Dicobalt Dibenzocyclooctyne Complexes
作者:Sinisa Djurdjevic、James R. Green
DOI:10.1021/ol402617a
日期:2013.11
Hexacarbonyldicobalt complexes of biaryl-substituted 4-methoxybutynones and 4-methoxy-2-butynes undergo intramolecular Nicholas reactions to form dibenzocyclooctyne-Co-2(CO)(6) complexes in good yields. Reductive decomplexation of the cyclization products is possible, and the method has been applied to a formal synthesis of isoschizandrin.