Molecular cascades. 1. Tandem cyclopropyl iminium ion rearrangement-[4+2] cycloaddition reactions
作者:Robert K. Boeckman、Scott R. Breining、Argyrios Arvanitis
DOI:10.1016/s0040-4020(97)90402-6
日期:1997.6
cases bearing an unsaturated tether in good yield. The resulting dienamines subsequently undergo both inter- and intramolecular [4+2] cycloaddition reactions. Good yields were obtained for a number of cases of intramolecular intermolecular cycloaddition reactions affording cycloadducts in good yields with sufficiently reactive dienophiles such as fumarate, acrylate and methacrolein. Evidence suggests
一种串联cyclopropyliminium离子重新排列霍夫曼消除反应,得到快速访问3-乙烯基Δ 2个-pyrrolines在某些情况下轴承以良好收率的不饱和系绳。所得的二烯胺随后经历分子间和分子内[4 + 2]环加成反应。对于分子内分子间环加成反应的许多情况,均获得了良好的收率,从而以足够的反应性亲二烯体如富马酸酯,丙烯酸酯和甲基丙烯醛以良好的收率提供了环加合物。有证据表明,这些环加成反应的途径尚未确定。