Copper-Catalyzed Intramolecular Aldehyde–Ketone Nucleophilic Additions for the Synthesis of Chromans Bearing a Tertiary Alcohol Motif
作者:Chenghao Zhu、Wenbo Jiang、Da Ma
DOI:10.1021/acs.joc.3c02365
日期:2024.1.19
The synthesis of chroman-3-ol derivatives via intramolecular nucleophilic additions has been established. Aldehydes can be used as alkyl carbanion equivalents viareductive polarity reversal which is facilitated by a copper catalyst and N-heterocyclic carbene ligand under mild conditions. The key to success is the difference in reaction activity between aldehydes and ketones. Finally, this methodology
作者:Hiroshi Takikawa、Yoshifumi Hachisu、Jeffrey W. Bode、Keisuke Suzuki
DOI:10.1002/anie.200600268
日期:2006.5.19
Modified Chiral Triazolium Salts for Enantioselective Benzoin Cyclization of Enolizable Keto-Aldehydes: Synthesis of (+)-Sappanone B
作者:Hiroshi Takikawa、Keisuke Suzuki
DOI:10.1021/ol070929p
日期:2007.7.1
Asymmetric synthesis of (+)-sappanone B (1), a natural product with a 3-hydroxy chromanone structure, was achieved via enantioselective benzoin cyclization by using a modified Rovis catalyst and triethylamine. This catalyst enabled the successful benzoin cyclization of readily enolizable keto-aldehydes.