Solvent-free synthesis of azulene derivatives via Passerini reaction by grinding
作者:Koichi Sato、Takumi Ozu、Naoko Takenaga
DOI:10.1016/j.tetlet.2012.11.148
日期:2013.2
An efficient and convenient approach to the synthesis of azulene derivatives bearing a carboxamide unit based on solvent-free Passerinireaction, using grinding is described. This method provides several advantages such as high efficiency, operational simplicity, and mild conditions.
The Ugi reaction with isocyanoazulene 1 afforded a variety of azulene-heterocycle hybrids. The described approach could be applied to combinatorial synthesis of biologically active compounds of the azulene series.
FACILE SYNTHESIS OF GUAIAZULENE-HETEROCYCLE HYBRIDS VIA MULTICOMPONENT REACTIONS INVOLVING FORMATION OF ZWITTERIONIC INTERMEDIATES
作者:Koichi Sato、Erina Yokoo、Naoko Takenaga
DOI:10.3987/com-13-12680
日期:——
The synthesis of a series of guaiazulene-heterocycle hybrids via zwitterionic intermediates was performed. The multicomponent reactions of 3-isocyano-7-isopropyl-1,4-dimethylazulene 1, dimethyl acetylenedicarboxylate 2, and a third reactant 3 (cyclic CH-acids, phenols, aldehydes or amines) proceeded to afford heterocyclic guaiazulene derivatives 4.