Co-reporter:Bradley C. Doak, Martin J. Scanlon, and Jamie S. Simpson
Organic Letters 2011 Volume 13(Issue 3) pp:537-539
Publication Date(Web):January 12, 2011
DOI:10.1021/ol102852z
Bis(1,2,3-triazole)s have attracted recent interest as coordinating ligands for transition metals. Here we report a rapid, modular method for the synthesis of 1,1′-disubstituted-4,4′-linked unsymmetrical bis(1,2,3-triazole)s. The method employs sequential copper catalyzed azide−alkyne cycloaddition and deprotection steps on a monosilylbutadiyne. TMS (trimethylsilyl) and TIPS (triisopropylsilyl) were both investigated with TIPS being the preferred protecting group due to increased stability. The reactions were amenable to one-pot synthesis, and an optimized one-pot, three-step procedure was developed.