Atroposelective Biaryl Coupling with Chiral Catalysts: Total Synthesis of the Antileishmanial Naphthylisoquinoline Alkaloids Ancistrotanzanine B and Ancistroealaine A
[reaction: see text] The first total synthesis of the naphthylisoquinoline alkaloid ancistrotanzanine B and its atropo-diastereomer, ancistroealaine A, is described. The key step is the construction of the rotationally hindered and thus stereogenicbiaryl axis by Suzuki coupling. While only weak internal asymmetric inductions by the stereogenic center in the dihydroisoquinoline part were observed,
An efficient cobalt-catalyzed asymmetrichydrogenation of internal simple enamides has been developed, especially its convergent pattern for E/Z-substrates. Excellent enantioselectivity, wide substrate scope, and valuable applications were shown.
Unprecedented Direct Asymmetric Total Syntheses of 5,8’‐Naphthylisoquinoline Alkaloids from their Fully Substituted Precursors Employing a Novel Nickel/N,N‐ligand‐Catalyzed Atroposelective Cross‐Coupling Reaction
作者:Dino Berthold、Willem A. L. van Otterlo
DOI:10.1002/chem.202302070
日期:2023.11.2
Four different 5,8’-coupled naphthylisoquinoline alkaloids have been prepared via a general and concise synthetic pathway directly from the corresponding cross-coupling reaction precursors. For the cross-coupling key step, a new Negishi cross-coupling reaction, employing a Ni/N,N-ligand-based catalyst providing the natural products in good yields and high enantiomeric purities, has been developed.