作者:Yurngdong Jahng、Moinul Karim
DOI:10.1016/j.tet.2015.11.026
日期:2016.1
The Friedlander reaction of cyclohexanone with 3-aminoanthracene-2-carbaldehyde afforded corresponding 1,2,3,4-tetrahydronaphtho[2,3-b]acridine in 79%, which was also prepared by reduction of the alternative Friedlander adduct 1,2,3,4-tetrahydronaphtho[2,3-b]acridine-7,12-dione, in 56% yield. Dehydrogenation of 1,2,3,4-tetrahydronaphtho [2,3-b]acridine led to naphtha[2,3-b]acridine (5-azapentacene). 1,2,3,4-Tetrahydro-5-azapentacene and 5-azapentacene are somewhat unstable in solution while these compounds keep their identity in solid state a little longer period of time under inert gas in the refrigerator. The decomposition rate of 1,2,3,4-tetrahydro-5-azapentacene was determined by UV absorption spectra to afford a rate constant, 3.92 x 10(-3) s(-1) (R=0.982) while 5-azapentacene was too unstable to determine the decomposition rate constant. (C) 2015 Elsevier Ltd. All rights reserved.