Novel heterocyclic systems. Part<b>27</b>. The synthesis of various diazathianthrenes and the discrimination of isomeric structures using<sup>13</sup>C-NMR and lanthanide induced shift data
作者:Charles M. Lindsay、Keith Smith、Gary E. Martin
DOI:10.1002/jhet.5570240525
日期:1987.9
led to the formation of the previously reported 1,6-diazathianthrene as a by-product in a 22% yield. The new ring systems were characterized by a combination of 13C nmr and 1H lanthanide-induced shiftsusing Eu(fod)3.
据报道,以前未知的1,7-1,8-和1,9-二氮杂蒽蒽的合成。前两种体系是通过2,3-二巯基吡啶的二价阴离子与3-氯-4-硝基吡啶-1-氧化物的缩合制备的,而后者采用了2-氯-3-硝基吡啶。1,9-二氮杂蒽蒽的制备还导致了先前报道的副产物1,6-二氮杂蒽蒽的形成,产率为22%。新环系统的特征是使用Eu(fod)3结合13 C nmr和1 H镧系元素引起的位移。
Chemistry of the phenoxathiins and isosterically related heterocycles. XXV . Synthesis of 1,6-diazathianthrene from 3-mercaptopyridin-2(1<i>H</i>)-thione<i>via</i>a novel dehydrothiolation reaction in the presence of triethylamine
作者:Salvador Puig-Torres、Charles H. Womack、Gary E. Martin、Keith Smith
DOI:10.1002/jhet.5570190665
日期:1982.11
The generation of the dianion of 3-mercaptopyridin-2(1H)-thione with triethylamine in N,N-dimethylform-amide followed by reaction in the presence of 2-chloronitrobenzene fails to give 1-azathianthrene which is formed in good yield when sodium hydride was employed as the base. The principle product isolated from the reaction was instead 1,6-diazathianthrene. Mechanistic considerations are discussed