Expanding the Substrate Scope for C−H Amination Reactions: Oxidative Cyclization of Urea and Guanidine Derivatives
作者:Mihyong Kim、John V. Mulcahy、Christine G. Espino、J. Du Bois
DOI:10.1021/ol052920y
日期:2006.3.1
[reaction: see text] Oxidative C-H amination of N-trichloroethoxysulfonyl-protected ureas and guanidines is demonstrated to proceed in high yield for tertiary and benzylic-derived substrates. The success of these reactions is predicated on the choice of the electron-withdrawn 2,2,2-trichloroethoxysulfonyl (Tces) protecting group, the commercial catalyst Rh(2)(esp)(2) (1-2 mol %), and toluene as solvent