I. Cartagena

THE STAUDINGER REACTION OF O-AZIDOBENZALDEHYDE WITH TRIPHENYLPHOSPHINE REVISITED : INFLUENCE OF THE TEMPERATURE ON THE NATURE OF THE REACTION PRODUCTS

The reaction of o-azidobenzaldehyde 1 with TPP at 0°C leads to the expected iminophosphorane 2 and the indazole derivative 3 while at −20°C the phosphazide 4 was the only reaction product. The close related compounds 2 and 4 shows stricking differences in reactivity towards primary amines.

Fused Mesoionic Heterocycles Analogues of Heptafulvene: Synthesis of 1, 3, 4-Thiadiazolo[3, 2-a]Pyridylium-2-Methylides

Abstract A number of 1, 3, 4-thiadiazolo[3, 2-a]pyridylium-2-methylides have been prepared either from 1-amino-4, 6-diphenylpyridine-2-thione and 3,3-bis(methylthio) acrylonitriles or by the reaction of the conjugate anion of active methylene compounds with 2-methylthio-1, 3, 4-thiadiazolo[3, 2-a]pyridinium cations.

Reaction of 2-Phenyl-3-Hydroxy-4-Thioxo-3,4-Dihydroquinazoline Sodium Salt With Imidoyl Chlorides: Synthesis of Heteroaryl Sulfenamides

Abstract A number of heteroaryl sulfenamides have been prepared through [3,3]-sigmatropic rearrangement in the reaction of 2-phenyl-3-hydroxy-4-thioxo-3,4-dihydroquinazoline sodium salt with diaryl imidoyl chlorides under mild and neutral conditions.