Sulfonyl-1,2,3-Triazoles: Convenient Synthones for Heterocyclic Compounds
作者:Mikhail Zibinsky、Valery V. Fokin
DOI:10.1002/anie.201206388
日期:2013.1.28
As easy as 1,2,3: Readily available and shelf‐stable 1‐sulfonyl‐1,2,3‐triazoles react with aldehydes and aldimines in the presence of RhII catalysts to produce 4‐oxazolines and 1,2,5‐trisubstituted imidazoles (see scheme).
A novel process using N-benzylhydroxylamine hydrochloride as a “C1N1 synthon” in [2+2+1] cyclization for the construction of 1,2,5-trisubstituted imidazoles has been described for the first time. The key to realizing this process lies in capturing arylamines by in situ generated novel acyl ketonitrone intermediates. Subsequent tautomerization activates the α-C(sp3)–H of N-benzylhydroxylamines, and