Azobridges from azines, XVII1. Intra- and intermolecular [3+2] cycloaddition between nonstabilized azomethineimines and alkenes
作者:Petra Hoffman、Siegfried Hünig、Leonhard Walz、Karl Peters、Hans-Georg von Schnering
DOI:10.1016/0040-4020(95)00818-s
日期:1995.11
distant position are quatemized by Me3OBF4 to 1,MeBF4 and 3,MeBF4, whereas MeI produces the cage compounds 2,HX and 4,HX. These [3+2] cycloadducts also are quantitatively formed from 1,MeBF4 and 3,MeBF4 with catalytic amounts of azo compounds. Intermolecular [3+2] cycloadditions occur with a mixture of DBH (5) or DBO (8), MeI and a variety of alkenes (→ HI) salts of (6, 7, 9 — 12). The intermediate azomethineimines
在Me 3 OBF 4变为1,MeBF 4和3,MeBF 4的情况下,在平行但相距遥远的位置包含CC双键的偶氮化合物1和3被季铵化,而MeI产生笼状化合物2,HX和4,HX。这些[3 + 2]环加合物还由1,MeBF 4和3,MeBF 4与催化量的偶氮化合物定量形成。分子间的[3 + 2]环加成发生与DBH的混合物(5)或DBO(8),将MeI的(盐和各种烯烃的(→HI)6,7,9 - 12)。如果被亚芴基稳定,则中间体偶氮甲亚胺可以被分离(20、22、24),但是在紧密的平行CC键(25 → 26)存在下不能分离。