Organoiron complexes in organic synthesis. 33. Tricarbonylcyclohexadienyliron complexes as aryl cation equivalents: a formal synthesis of (.+-.)-O-methyljoubertiamine
Transition metal mediated asymmetric synthesis, part 151 directing group competition in organoiron intermediates in the synthesis of (±)-O-methyljoubertiamine
作者:G.Richard Stephenson、Harry Finch、David A. Owen、Stephen Swanson
DOI:10.1016/s0040-4020(01)87274-4
日期:1993.1
Directing groups work first in concert and then in competition to control the introduction of aryl and 2-dimethylaminoethyl groups by a sequence of two nucleophile additions to cationic tricarbonyl(eta5-cyclohexadienyl)iron(1+) intermediates in a synthesis of O-methyljoubertiamine that employs an iterative approach. This synthesis provides an example of the successful use of directing group competition to effect the reversal of undesired directing effects in target oriented applications of electrophilic pi-complexes.
KAMETANI, TETSUJI;NISHIMURA, MASATO;HIGURASHI, KATSUYUKI;SUZUKI, YUKIO;TS+, J. ORG. CHEM., 52,(1987) N 23, 5233-5239
TOTAL SYNTHESIS OF SCELETIUM (AIZOACEAE) ALKALOIDS. THE CINNAMONITRILE ROUTE. THE TOTAL SYNTHESIS OF RACEMIC O-METHYL JOUBERTIAMINE AND MESEMBRINE
作者:Ignacio H. Sanchez、F. Ramón Tallabs
DOI:10.1246/cl.1981.891
日期:1981.7.5
A new method of synthesis of Sceletium (Aizoaceae) alkaloids based on the introduction of a “formyl anion” equivalent at the β-position of a cinnamonitrile, followed by Robinson annulation and final modification of the resulting cyanomethyl side chain is described. The method has been successfully applied to the total synthesis of racemic O-methyljoubertiamine (1) and mesembrine (2).
Organoiron complexes in organic synthesis. 33. Tricarbonylcyclohexadienyliron complexes as aryl cation equivalents: a formal synthesis of (.+-.)-O-methyljoubertiamine
作者:Anthony J. Pearson、Ian C. Richards、Derek V. Gardner