Lithiation of 3,4-bis(tri-n-butylstannyl)furan: regiospecific synthesis of unsymmetrical 3,4-disubstituted furans
作者:Yun Yang、Henry N. C. Wong
DOI:10.1039/c39920001723
日期:——
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。