Furopyridines.<b>XVII</b>. Cyanation, chlorination and nitration of furo[3,2-<i>b</i>]pyridine<i>N</i>-oxide
作者:Shunsaku Shiotani、Katsunori Taniguchi
DOI:10.1002/jhet.5570330409
日期:1996.7
The N-oxide 2 of furo[3,2-b]pyridine (1) was cyanated by the Reissert-Henze reaction with potassium cyanide and benzoyl chloride to give 5-cyano derivative 3, which was converted to the carboxamide 4, carboxylic acid 5, ethyl ester 6 and ethyl imidate 8. Chlorination of 2 with phosphorus oxychloride yielded 2-9a, 3- 9b, 5- 9c and 7-chloro derivative 9d. Reaction of 9d with sodium methoxide, pyrrolidine
通过氰化钾和苯甲酰氯的Reissert-Henze反应使呋喃[3,2- b ]吡啶(1)的N-氧化物2氰化,得到5-氰基衍生物3,将其转化为羧酰胺4羧酸5,乙酯6和亚胺乙酯8。的氯化2用三氯氧化磷,得到2-9A,3- 9B,5- 9C和7-氯衍生物9D。的反应9D与甲醇钠,吡咯烷,N,N-二甲基甲酰胺和氰基乙酸乙酯,得到7-甲氧基- 10,7-(1-吡咯烷基) - 11和7- dimethylaminofuro并[3,2- b ]吡啶(14)和7-(1-氰基-1-乙氧基羰基)亚甲基-4,7-二氢呋喃[3,2- b ]吡啶(12)。用发烟硝酸和硫酸的混合物硝化2,得到2-硝基呋喃并[3,2- b ]吡啶N-氧化物(15)。