An unexpected reaction of aryl isocyanides with 4-chloro-2-oxo-2H-chromene-3-carbaldehyde leads to chromeno[4,3-b]quinolin-6-ones in good yields.
![Graphical abstract: Facile synthesis of chromeno[4,3-b]quinolin-6-ones from unexpected reactions of aryl isocyanides with 4-chloro-2-oxo-2H-chromene-3-carbaldehyde](http://hg.y866.cn/compound/lib/scimg/usr/1/B600540C.jpg)
