Gold(I)-Catalyzed Ring-Expanding Spiroannulation of Cyclopropenones with Enynes
摘要:
The gold(I)-catalyzed ring-expanding spiroannulation of cyclopropenones with enynes is reported here. A molecule of water is incorporated into the products during the spiroannulation to afford spirocyclic cyclopentenones containing an alcohol functionality.
Herein, an unprecedented non-noble-metal-catalyzed oxidation/cyclization of ene-ynamides is developed, allowing the synthesis of diversely functionalized lactams in moderate to good yields with excellent diastereoselectivities without the observation of typical cyclopropanation products. In combination with Ellman’s tert-butylsulfinimine chemistry, chiral γ-lactams containing three contiguous stereocenters
Gold(I)-Catalyzed Ring-Expanding Spiroannulation of Cyclopropenones with Enynes
作者:Takanori Matsuda、Yusuke Sakurai
DOI:10.1021/jo500045n
日期:2014.3.21
The gold(I)-catalyzed ring-expanding spiroannulation of cyclopropenones with enynes is reported here. A molecule of water is incorporated into the products during the spiroannulation to afford spirocyclic cyclopentenones containing an alcohol functionality.
Silver(I)-Catalyzed Deprenylation of Allylsulfonamide Derivatives
作者:Fuyuhiko Inagaki、Shisen Hira、Chisato Mukai
DOI:10.1055/s-0036-1589066
日期:2017.10
The silver(I)-catalyzed deprenylation of sulfonamide bearing prenyl functional groups on the nitrogen atom has been developed. In this reaction, the prenyl moiety was selectively eliminated without allyl or benzyl cleavage on the nitrogen atom. In addition, geranyl was also applicable for this elimination reaction. Furthermore, sulfonamide possessing two prenyl groups underwent a double deprenylation