Furopyridines.<b>XXI</b>. Synthesis of cyano derivatives of furo-[2,3-<i>b</i>]-, -[2,3-<i>c</i>]- and -[3,2-<i>c</i>]pyridine and their conversion to derivatives having another carbon-substituent
作者:Shunsaku Shiotani、Katsunori Taniguchi
DOI:10.1002/jhet.5570340223
日期:1997.3
Cyanation of furo[2,3-b]-, -[2,3-c]- and -[3,2-c]pyridine N-oxides 1a, 1b and 1c by the Reissert-Henze method, reaction with benzoyl chloride and trimethylsilyl cyanide in dichloromethane and the reaction with trimethylsilyl cyanide and triethylamine in acetonitrile afforded 6-cyanofuro[2,3-b]- 2a, 7-cyanofuro[2,3-c]- 2b and 4-cyanofuro[3,2-c]pyridine 2c in moderate to excellent yield. The cyano group
用Reissert-Henze方法氰化呋喃[2,3- b ]-,-[2,3- c ]-和-[3,2- c ]吡啶N-氧化物1a,1b和1c,与苯甲酰氯反应在二氯甲烷和氰化三甲基硅烷和与反应氰化三甲基硅烷和三乙胺在乙腈中,得到6-5-氰基呋喃并[2,3- b ] -图2a,7- 5-氰基呋喃并[2,3- ç ] - 2B和4- 5-氰基呋喃并[3,2- c ]吡啶2c的产率中等至优异。2a,2b和2c中的氰基被转化为羧酰胺3a,3b和3c,乙基酰亚胺5a,5b和5c以及羧酸乙酯6a,6b和6c。所述的反应Ñ -oxides与三甲基甲硅烷溴化物在乙腈中,得到脱氧呋喃并吡啶7A和图7D,bifuropyridyl图8b和图8c,以及Ñ氧化物9的图8c。