A General Strategy for the Synthesis of Truxinate Natural Products Enabled by Enantioselective [2+2] Photocycloadditions
作者:Matthew J. Genzink、Matthew D. Rossler、Herman Recendiz、Tehshik P. Yoon
DOI:10.1021/jacs.3c07132
日期:2023.9.6
Pseudodimeric cyclobutanes constitute a large class of natural products that could, in principle, be efficiently synthesized via [2+2] photocycloadditions. However, the difficulty in developing chemo-, regio-, diastereo-, and enantioselective cycloadditions has limited their use in asymmetric syntheses. Herein, we show that chiral acid catalysts promote highly selective visible-light photocycloadditions
Catalytic Conjugate Additions of Carbonyl Anions under Neutral Aqueous Conditions
作者:Michael C. Myers、Ashwin R. Bharadwaj、Benjamin C. Milgram、Karl A. Scheidt
DOI:10.1021/ja0520161
日期:2005.10.1
The conjugateaddition of carbonylanions catalyzed by thiazolium salts that is fully operative under neutral aqueous conditions has been accomplished. The combination of alpha-keto carboxylates and thiazolium-derived zwitterions produces reactive carbonylanions in a buffered protic environment that readily undergo conjugateadditions to substituted alpha,beta-unsaturated 2-acyl imidazoles. The scope
作者:Plachinski, Ellie F.、Kim, Hyung Joo、Genzink, Matthew J.、Sanders, Kyana M.、Kelch, Riley M.、Guzei, Ilia A.、Yoon, Tehshik P.
DOI:10.1021/jacs.4c04706
日期:——
has limited the use of photocycloaddition methodology toward the synthesis of this important class of naturalproducts. Herein, we demonstrate that acid-controlled precipitation of C-acyl imidazoles promotes a highly selective solid-state photocycloaddition, and the products of this reaction can be quickly transformed into truxillate naturalproducts.