N-Arylation by Aryl Isocyanates as a General Reaction: Useful Route to Disubstituted S,N- Diarylisothioureas

Synthesis of Phosphanylferrocenecarboxamides Bearing Guanidinium Substituents and Their Application in the Palladium‐Catalyzed Cross‐Coupling of Boronic Acids with Acyl Chlorides

“…As an alternative (route B in Scheme ), phosphane 2 was obtained by the guanylation of phosphanylamine 4 with 1 H ‐pyrazole‐1‐carboximidamide hydrochloride , . Amine 4 was accessed by the reaction of 3 with 1,2‐diaminoethane and is better stored in the form of the more stable hydrochloride 4· HCl, which is easily prepared by the addition of methanolic HCl and can be converted back into the free amine through the reaction with triethylamine (the crystal structure of 4· HCl was determined and is discussed in the Supporting Information).…”

Benzotriazole-Mediated Synthesis of Nitrogen-Containing Heterocycles

“…In the reaction of imine 219 with methylhydrazine, the formation of triazole 225 was observed, probably because intermediate 224 spontaneously eliminated one [168]. Benzotriazole-Mediated Synthesis of Nitrogen-Containing Heterocycles…”

Benzotriazole-Mediated Synthesis of Oxygen-Containing Heterocycles

“…The versatile and stable benzotriazole Vilsmeier-type reagent 219 [37] was used in combination with aroyl hydrazides 218 for the high-yielding and convenient preparation of 1,3,4-oxadiazoles 220 (Scheme 45) [73]. Similarly, di(benzotriazol-1-yl)methanimine 221 was successfully utilized for the preparation of 2-amino-5-aryl-1,3,4-oxadiazoles 222 from hydrazides 218 [74].…”