A Rhodium(I)-Catalyzed Demethylation−Cyclization of o-Anisole-Substituted Ynamides in the Synthesis of Chiral 2-Amido Benzofurans
摘要:
A Rh(I)-catalyzed demethylation-cyclization sequence for a direct transformation of o-anisole-substituted ynamides to benzofurans is described here. The Ag salt functions synergistically with Rh(I) for the key demethylation step.
Rhodium(I)-Catalyzed [2 + 2 + 2] Cycloadditions of Ynamides in the Synthesis of Amide-Substituted Chiral Biaryls
作者:Michael R. Tracey、Jossian Oppenheimer、Richard P. Hsung
DOI:10.1021/jo061683p
日期:2006.10.1
Rhodium(I)-catalyzed [2 + 2 + 2] cycloadditions of sterically encumbered aryl-substituted ynamides with various diynes are described here. These cycloadditions provide the synthesis of an array of new chiral amide-substituted biaryls that can be useful in future chiral ligand designs.
Copper(II)-Catalyzed Amidations of Alkynyl Bromides as a General Synthesis of Ynamides and <i>Z</i>-Enamides. An Intramolecular Amidation for the Synthesis of Macrocyclic Ynamides
作者:Xuejun Zhang、Yanshi Zhang、Jian Huang、Richard P. Hsung、Kimberly C. M. Kurtz、Jossian Oppenheimer、Matthew E. Petersen、Irina K. Sagamanova、Lichun Shen、Michael R. Tracey
DOI:10.1021/jo060230h
日期:2006.5.1
method for the coupling of a wide range of amides with alkynyl bromides is described here. This novel amidation reaction involves a catalytic protocol using copper(II) sulfate-pentahydrate and 1,10-phenanthroline to direct the sp-C−N bond formation, leading to a structurally diverse array of ynamides including macrocyclic ynamides via an intramolecular amidation. Given the surging interest in ynamide chemistry
A Rhodium(I)-Catalyzed Demethylation−Cyclization of <i>o-</i>Anisole-Substituted Ynamides in the Synthesis of Chiral 2-Amido Benzofurans
作者:Jossian Oppenheimer、Whitney L. Johnson、Michael R. Tracey、Richard P. Hsung、Pei-Yuan Yao、Renhe Liu、Kang Zhao
DOI:10.1021/ol0707362
日期:2007.6.1
A Rh(I)-catalyzed demethylation-cyclization sequence for a direct transformation of o-anisole-substituted ynamides to benzofurans is described here. The Ag salt functions synergistically with Rh(I) for the key demethylation step.