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.