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.
Catalyst-Free Intramolecular Formal Carbon Insertion into σ-CC Bonds: A New Approach toward Phenanthrols and Naphthols
作者:Ying Xia、Peiyuan Qu、Zhenxing Liu、Rui Ge、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201209269
日期:2013.2.25
of carbonyl groups in keto aldehyde substrates has been exploited for the synthesis of phenanthrols, naphthols, and their heteroatom‐containing analogues. Key to this highly efficient and robust methodology is the catalyst‐free intramolecularformal diazo carboninsertion of N‐tosylhydrazones into keto CCbonds (see scheme).