isopropylidene acetal unit from well‐known TADDOLligands improved the performance of the derived phosphoramiditeligands in asymmetric goldcatalysis (see scheme; Ts=4‐toluenesulfonyl). X‐ray crystallography showed that the binding pocket has an effective threefold symmetry, with through‐space interactions between the arene rings of the ligand and the gold center.
The analysis of two distinct strategies toward the enantioselective formal total synthesis of (+)-Gelsenicine
作者:Haofan Ji、Phil C. Knutson、Christopher M. Harrington、Yan-Ting Ke、Eric M. Ferreira
DOI:10.1016/j.tet.2023.133278
日期:2023.3
A full account of a formalenantioselective total synthesis of (+)-gelsenicine is described. Separate strategies based on catalytic cycloisomerization as the central step are considered. One plan involves chirality transfer from enantioenriched substrates, while the other employs asymmetric catalysis. The chirality transfer strategy is less effective, while in the latter, phosphoramidite- and bisphosphine-gold