Synthesis and Facile Dearomatization of Highly Electrophilic Nitroisoxazolo[4,3-b]pyridines
作者:Maxim A. Bastrakov、Alexey K. Fedorenko、Alexey M. Starosotnikov、Ivan V. Fedyanin、Vladimir A. Kokorekin
DOI:10.3390/molecules25092194
日期:——
A number of novel 6-R-isoxazolo[4,3-b]pyridines were synthesized and their reactions with neutral C-nucleophiles (1,3-dicarbonyl compounds, π-excessive (het)arenes, dienes) were studied. The reaction rate was found to be dependent on the nature of the substituent 6-R. The most reactive 6-nitroisoxazolo[4,3-b]pyridines are able to add C-nucleophiles in the absence of a base under mild conditions. In
合成了许多新型 6-R-异恶唑并 [4,3-b] 吡啶,并研究了它们与中性 C-亲核试剂(1,3-二羰基化合物、π-过量(杂)芳烃、二烯)的反应。发现反应速率取决于取代基 6-R 的性质。反应性最强的 6-硝基异恶唑并 [4,3-b] 吡啶能够在温和条件下在没有碱的情况下添加 C-亲核试剂。此外,这些化合物很容易在吡啶环的芳香键 C=C(NO2) 上发生 [4+2]-环加成反应,从而表明 6-NO2-异恶唑并 [4,3-b] 吡啶的超亲电性。