3,5-Di-(pyridin-2-yl)-[1,2,4]-triazines 3 are converted to 4-tributylstannyl-2,6-oligopyridines 5 regioselectively via [4+2] cycloadditions with ethynyltributyltin. Bromination of the tin compounds 5 leads to 4-bromo-2,6-oligopyridines 7. Cross-coupling reactions of compounds 5 and 7 under Stille conditions yield branched oligopyridines 8 containing 8 to 14 pyridine units.
3,5-二- (
吡啶-2-基) - [1,2,4] -triazines 3被转化为4-三
丁基锡烷基-2,6- oligopyridines 5区域选择性地通过[4 + 2]环加成以ethynyltributyltin。
锡化合物5的
溴化反应生成4-
溴2,6-寡
吡啶7。交叉耦合的化合物的反应5和7的Stille条件下的产量支oligopyridines 8含有8至14
吡啶单元。