Palladium-catalyzed benzannulation of conjugated enynes. Enhanced reactivity of alkoxycarbonyl- and cyanoenynes
作者:Shinichi Saito、Norie Tsuboya、Yukiyasu Chounan、Tsutomu Nogami、Yohinori Yamamoto
DOI:10.1016/s0040-4039(99)01520-8
日期:1999.10
reactivity of alkoxycarbonyl- and cyanoenynes in the homo-benzannulation of conjugated enynes. The introduction of these electron-withdrawing groups enabled us to carry out the benzannulation of 1-substituted enynes as well as 1,2- and 2,4-disubstituted enynes, which have much lower reactivity compared to 2- or 4-monosubstituted enynes. Polysubstituted benzenes were prepared in a highly regioselective manner
我们报道了在共轭烯炔的均苯并环烷中羰基羰基和氰基炔的高反应活性。这些吸电子基团的引入使我们能够进行1-取代的炔烃以及1,2-和2,4-二取代的炔烃的苯并环合,与2-或4-单取代的炔烃相比,它们的反应性要低得多。以高度区域选择性的方式以良好至优异的产率制备了多取代的苯。