BANERT, KLAUS, CHEM. BER., 122,(1989) N, C. 911-918
作者:BANERT, KLAUS
DOI:——
日期:——
<i>N</i>H-1,2,3-Triazoles from Azidomethyl Pivalate and Carbamates: Base-Labile N<i>-</i>Protecting Groups
作者:K. Barry Sharpless、Jon C. Loren、Antoni Krasiński、Valery V. Fokin
DOI:10.1055/s-2005-918944
日期:——
NH-1,2,3-triazoles have been prepared via the copper(I)-catalyzed 1,3-dipolar cycloaddition between terminal alkynes and three N-protected organic azides, azidomethyl pivalate, azidomethyl morpholine-4-carboxylate, and azidomethyl N,N-diethylcarbamate. These organic azides were easily prepared on 0.1-mol scale in one or two steps from inexpensive commercially available materials. The cleaving properties of N-substituents in the resulting 1,2,3-triazole products with aqueous sodium hydroxide vary from <10 minutes at room temperature in the case of N-methyl pivalate, to 24 hours at room temperature in the case of N-methyl morpholine-4-carboxylate, to 24 hours at 85 °C in the case of N-methyl diethylcarbamate.