NNNifty targets: In a straightforward copper‐mediated synthesis of 1,4‐disubstituted and 1,4,5‐trisubstituted 1,2,3‐triazoles, readily available aniline and N‐tosylhydrazone substrates underwent cyclization through CN and NN bond formation (see scheme; Piv=pivaloyl, Ts=p‐toluenesulfonyl). This method enables the preparation of 1,2,3‐triazoles with high efficiency under mild conditions without the
Microwave-Assisted Stille Reactions as a Powerful Tool for Building Polyheteroaryl Systems Bearing a (1H)-1,2,4-Triazole Moiety
作者:P. Prieto、A. Díaz-Ortiz、C. Cebrián、A. de Cózar、A. de la Hoz、J. Carrillo、A. Rodriguez、F. Montilla
DOI:10.1055/s-0029-1218533
日期:2010.1
Stille couplings and the combination of Stille/Heck cross-couplingreactions provide useful access to tricyclic systems with valuable material properties from 3,5-dibromo-1,2,4-triazoles. The reactions can all be dramatically improved undermicrowaveirradiation.
A green, general and efficient I2/TBHP mediated syntheticmethodtoward 1,4-disubstituted 1,2,3-triazoles via the reactions of acetophenones, tosylhydrazine and anilines within 35 min in a two-step continuous flow system has been developed. The reaction proceeds smoothly to afford 1,4-disubstituted 1,2,3-triazoles in moderate to good yield under metal- and azide-free conditions by using I2 as a catalyst