The new and simple ‘LEGO’ system: Its application to the synthesis of 4-stannyl-, 4-bromo- and branched oligopyridines
作者:Gunther R Pabst、Jürgen Sauer
DOI:10.1016/s0040-4020(99)00179-9
日期:1999.4
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.