Furopyridines.<b>XXII</b>. Elaboration of the<i>C</i>-substituents<i>alpha</i>to the heteronitrogen atom of furo[2,3-<i>b</i>] -, -[3,2-<i>b</i>] -, -[2,3-<i>c</i>]- and -[3,2-<i>c</i>]pyridine
作者:Shunsaku Shiotani、Katsunori Tanigochi
DOI:10.1002/jhet.5570340329
日期:1997.5
cyanopyridine derivatives 1a-d with methyl- and phenylmagnesium bromide yielded the corresponding acylpyridine compounds 2a-d and 3a-d. Furopyridine N-oxides 4a-d were converted into the compounds having a phenyl group at the α-position to the ring nitrogen 5a-d. Reduction of 1a-d and the carboxylic esters 6a-d with diisobutylaluminium hydride yielded the corresponding amines 7a-d and aldehydes 9a-d. The
稠合的环氰基吡啶衍生物1a-d与甲基和苯基溴化镁的格氏反应产生相应的酰基吡啶化合物2a-d和3a-d。将呋喃吡啶N-氧化物4a-d转化为在环氮5a-d的α位具有苯基的化合物。用氢化二异丁基铝还原1a-d和羧酸酯6a-d,得到相应的胺7a-d和醛9a-d。将醛转化为硝基乙醇衍生物10a-d通过与硝基甲烷二乙基膦酰基乙酸酯的Wittig-Horner反应与硝基甲烷和丙烯酸酯化合物11a-d缩合。