Furopyridines.<b>XXVI</b>. Reactions of cyanopyridine derivatives of furo[2,3-<i>b</i>]-, -[3,2-<i>b</i>]-, -[2,3-<i>c</i>]- and -[3,2-<i>c</i>]pyridine
α-cyanopyridine derivatives of furopyridines 1a-d gave the 2,3-dibromo-2,3-dihydro compounds 2a-d in excellent yields. Treatment of 2a-d with sodium hydroxide in methanol yielded compounds formed through the dehydrobromination and solvolysis of the nitrile. N-Oxidation of 1a and 1b gave N-oxide in much poor yield, while 1c and 1d gave the N-oxide 13c and 13d in good yields. The nucleophilic reactions (cyanation