6-chloro-3-phenyl-[1,3]oxazolo[4,5-b]pyridin-2-one

2-phenylfuro[3,2-c]pyridine-3-carbonitrile

dimethyl 6-chlorofuro[3,2-b]pyridine-2,3-dicarboxylate

7-chloro-furo[3,2-c]pyridine-2,3-dicarboxylic acid dimethyl ester