Synthesis of 4-Aryl-1,7-naphthyridine-2(1H)-thiones by the Electrocyclic Reaction of 4-(1-Arylalk-1-enyl)-3-isothiocyanatopyridines Generated in situ from the Corresponding Isocyanides
作者:Kazuhiro Kobayashi、Taketoshi Kozuki、Teruhiko Suzuki
DOI:10.1002/hlca.201100408
日期:2012.4
7‐naphthyridine‐2(1H)‐thiones 7 has been developed. The method is based on the electrocyclic reaction of 4‐(1‐arylalk‐1‐enyl)‐3‐isothiocyanatopyridines 6, generated in situ by the treatment of the respective isocyanides 5 with S8 in the presence of a catalytic amount of selenium. The isocyanides 5 can be easily prepared from commercially available pyridin‐3‐amine by conventional organic reactions.
已经开发了一种方便的合成方法,用于4-取代和3,4-二取代的1,7-萘啶-2-(1 H)-硫酮7。该方法是基于4-(1- arylalk -1-烯基)的电环化反应-3- isothiocyanatopyridines 6,产生原位通过处理相应的异腈的5以S 8中硒的催化量存在。异氰酸酯5可以很容易地通过常规的有机反应由市售的吡啶-3-胺来制备。