Inverted regioselectivity of C–H amination: Unexpected oxidation at β- rather than γ-C–H
作者:Filip J. Wyszynski、Amber L. Thompson、Benjamin G. Davis
DOI:10.1039/c0ob00113a
日期:——
A rare example of β- over γ-CâH selectivity during Rh-catalysed sulfamate ester cyclisation is presented; from derivatives of 1,6-anhydro-β-D-mannopyranose, five-membered sulfamidates were formed in preference to the typical six-membered oxathiazinane intramolecular insertion products. A 3D structure of sulfamate 1 helps to rationalise this unusual selectivity and analyses suggest that nâÏ*(CH) interactions may be a key controlling factor.