Synthesis of functionalised pyrazolones and imidazolines/imidazoles through divergent cyclisation reactions
作者:Giorgio Abbiati、Antonio Arcadi、Orazio A Attanasi、Lucia De Crescentini、Elisabetta Rossi
DOI:10.1016/s0040-4020(01)00022-9
日期:2001.3
easily accessible α-aminohydrazones represent a simple and efficient method for the preparation of both 1-substituted and 1-unsubstituted-4-aminocarbonyl-1H-pyrazol-5(2H)-ones, whereas the copper promoted reactions provide a divergent facile regiocontrolled synthesis of the imidazoline/imidazole ring system. The copper-promoted reaction of the α-benzylaminohydrazone produces a 2-oxo-1,4-diazadiene derivative
易于获得的α-氨基hydr的碱促进反应代表了一种简单而有效的方法,用于制备1-取代的和1-未取代的-4-氨基羰基-1 H-吡唑-5(2 H)-酮,而铜促进的反应提供了咪唑啉/咪唑环系统的容易的区域控制的合成。α-苄基氨基hydr的铜促进的反应产生2-氧代-1,4-二氮杂二烯衍生物。最后,咪唑啉可以容易地水解为α-酮hydr。