Formation of 1,10-Disubstituted Benzo[<i>c</i>]cinnolines. Synthesis and Molecular Structure of 1-Amino-10-propylthiobenzo[<i>c</i>]cinnoline and Cyclization to 4-Propylcinnolino[5,4,3][<i>c,d,e</i>][1,2]benzothiazine
作者:Vladimir Benin、Piotr Kaszynski、Maren Pink、Victor G. Young
DOI:10.1021/jo0002691
日期:2000.10.1
benzo[c]cinnoline derivative 1 was prepared from the trinitrobiphenyl 2. Investigation of the mechanism of ring closure in 2, 5, and 8 revealed a complex reduction-oxidation-cyclization sequence. The mechanism is discussed in light of the stereoelectronic demands of the substituent functionalities. Benzo[c]cinnoline derivative 1 [C15H15N3S, monoclinic, P2(1)/c: a = 7.4063(3) A, b = 10.3739(5) A, c = 16
由三硝基联苯2制备了第一个1,10-杂二取代的苯并[c] cinnoline衍生物1。对2、5和8中闭环机理的研究揭示了一个复杂的还原-氧化-环化序列。根据取代基官能团的立体电子要求来讨论该机理。苯并[c] cinnoline衍生物1 [C15H15N3S,单斜晶,P2(1)/ c:a = 7.4063(3)A,b = 10.3739(5)A,c = 16.7642(8)A,beta = 91.816(1)度,Z = 4]及其5-N-氧化物7(N5)[C18H18N3OS,三斜晶,Pi:a = 8.1510(7)A,b = 8.6106(7)A,c = 12.102(1)A,α= 86.262 (1)度,β= 83.364(1)度,γ= 74.711(1)度,Z = 4]在结构上得到了表征,并显示出杂环明显的螺旋形扭曲。