Cyclopentane Construction by Rh-Catalyzed Intramolecular C−H Insertion: Relative Reactivity of a Range of Catalysts
- 15 May 2004
- journal article
- Published by American Chemical Society (ACS) in The Journal of Organic Chemistry
- Vol. 69 (12), 4276-4278
- https://doi.org/10.1021/jo0303766
Abstract
The preparation and Rh-mediated cyclization of the alpha-diazoester 1 are outlined, and its utility in determining the elements that contribute to the reactivity of the intermediate Rh-carbenoid is presented. The rate of disappearance of diazo ester 1 catalyzed by several representative Rh(II) complexes was determined. The observed relative rate constants for the reaction of the Rh(II) complexes with 1 varied over a range of >10(7). The reactivity of the Rh-carbenoid intermediate was explored using the ratio of the sum of (3 + 4 + 5) to 2 (cyclization vs elimination), the ratio of 3 to the sum of (4 + 5) (chemoselectivity), and the ratio of 4 to 5 (diastereoselectivity). It is striking that these four measures of reactivity were found to be independent of each other.This publication has 10 references indexed in Scilit:
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