Selective N2-Alkylation of 1H-Indazoles and 1H-Azaindazoles
作者:Allyn T. Londregan、Jennifer Clemens、Emily L. Bell
DOI:10.1055/s-0040-1719917
日期:2022.7
A general and selective procedure for the N2-alkylation of 1H-indazoles and 1H-azaindazoles is presented. Promoted by either trifluoromethanesulfonic acid or copper(II) triflate, diverse 1H-indazoles/azaindazoles are selectively alkylated with varied primary, secondary, and tertiary alkyl 2,2,2-trichloroacetimidates at the N2-nitrogen to afford the corresponding 2-alkyl-2H-indazoles/azaindazoles. Forty-one