3-(Tri-n-butylstannyl)-4-lithiofuran 2, obtained through tin–lithium exchange from 3,4-bis(tri-n-butylstannyl)furan 1, reacts regiospecifically with various electrophiles to give monosubstituted stannylfurans, which are converted into unsymmetrical 3,4-disubstituted furans utilising Stille's palladium-catalysed coupling reactions.
3-(三正
丁基锡基)-4-
锂呋喃2是通过
锡-
锂交换从3,4-双(三正
丁基锡基)
呋喃1获得的,它与各种电正体发生区域选择性反应,生成单取代
锡呋喃,这些
锡呋喃又通过斯蒂尔的
钯催化偶联反应转化为非对称的3,4-双取代
呋喃。