Examination of the mechanism of Rh(2)(II)-catalyzed carbazole formation using intramolecular competition experiments.
Examination of the mechanism of Rh(2)(II)-catalyzed carbazole formation using intramolecular competition experiments.
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DOI:
10.1021/jo901224k
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发表时间:
2009-09-04
期刊:
影响因子:
--
通讯作者:
Driver TG
中科院分区:
文献类型:
--
作者:
Stokes BJ;Richert KJ;Driver TG
The use of a rhodium(II) carboxylate catalyst enables the mild and stereoselective formation of carbazoles from biaryl azides. Intramolecular competition experiments of triaryl azides suggested the source of the selectivity. A primary intramolecular kinetic isotope effect was not observed and correlation of the product ratios with Hammett σ+-values produced a plot with two intersecting lines with opposite ρ-values. These data suggest that electronic donation by the biaryl π-system accelerates the formation of rhodium nitrenoid and that C–N bond formation occurs through a 4π-electron-5-atom electrocyclization.
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