Controlling the stereochemistry in 2-oxo-aldehyde-derived Ugi adducts through the cinchona alkaloid-promoted electrophilic fluorination
作者:Yuqing Wang、Gaigai Wang、Anatoly A Peshkov、Ruwei Yao、Muhammad Hasan、Manzoor Zaman、Chao Liu、Stepan Kashtanov、Olga P Pereshivko、Vsevolod A Peshkov
DOI:10.3762/bjoc.16.163
日期:——
In this report, we introduce a new strategy for controlling the stereochemistry in Ugi adducts. Instead of controlling stereochemistry directly during the Ugi reaction we have attempted to stereodefine the chiral center at the peptidyl position through the post-Ugi functionalization. In order to achieve this, we chose to study 2-oxo-aldehyde-derived Ugi adducts many of which partially or fully exist
Catalytic Enantioselective Construction of Decalin Derivatives by Dynamic Kinetic Desymmetrization of C2-Symmetric Derivatives through Aldol–Aldol Annulation
作者:Ravindra D. Aher、Atsuhiro Ishikawa、Masahiro Yamanaka、Fujie Tanaka
DOI:10.1021/acs.joc.2c00889
日期:2022.6.17
strategy that affords functionalized decalin derivatives with high enantioselectivities from C2-symmetric derivatives through aldol–aldol annulation. We identified the structural moieties of the catalyst necessary for the formation of the decalin derivative with high enantioselectivity. We elucidated the mechanisms of the catalyzed reactions: the first aldol reaction step was reversible, and the second