Cyclization of rhodium carbenoids using ester and amido carbonyl groups
作者:Erin A. Curtis、Kimberly J. Worsencroft、Albert Padwa
DOI:10.1016/s0040-4039(97)00617-5
日期:1997.5
Carbonyl ylide dipoles derived from diazoacetyl esters underwent 4 pi-electrocyclization to furnish bicyclic epoxides. Reaction of related alpha-diazoketo amides with rhodium(II) carboxylate catalysts resulted in cyclization on both the oxygen and nitrogen atoms of the amido group to give carbonyl and ammonium ylides. (C) 1997 Elsevier Science Ltd.
Rhodium(II)-Catalyzed Equilibration of Push-Pull Carbonyl and Ammonium Ylides. A Computationally Based Understanding of the Reaction Pathway
作者:Albert Padwa、James P. Snyder、Erin A. Curtis、Scott M. Sheehan、Kimberly J. Worsencroft、C. Oliver Kappe
DOI:10.1021/ja001088j
日期:2000.8.1
been found to undergo a rhodium(II)-catalyzed transformation, producing five-membered ammonium or carbonyl ylides depending on the reaction conditions used. In the absence of an external dipolarophile, ammonium ylides are the exclusive products formed. In most cases these ylides cannot be isolated as they readily undergo sigmatropic rearrangement or fragmentation reactions. In the presence of typical