Teaching old dogs (Fmoc-amine, azodicarboxylate, and phosphine) new tricks (triazolinones)

Exposure of Fmoc-amines to an excess of standard Mitsunobu reagents, azodicarboxylate and triphenylphosphine, at ambient temperature yielded triazolinone derivatives in high yield and purity. This transformation appeared to be general and the traditional Mitsunobu reaction can be carried out independently of triazolinone formation because the latter requires a high excess of reagents.